poke/t/piwik/piwik.js

/*!
 * Matomo - free/libre analytics platform
 *
 * JavaScript tracking client For PokeTube
 *
 * @link https://piwik.org
 * @source https://github.com/matomo-org/matomo/blob/master/js/piwik.js
 * @license https://piwik.org/free-software/bsd/ BSD-3 Clause (also in js/LICENSE.txt)
 * @license magnet:?xt=urn:btih:c80d50af7d3db9be66a4d0a86db0286e4fd33292&dn=bsd-3-clause.txt BSD-3-Clause
 */
// NOTE: if you change this above Piwik comment block, you must also change `$byteStart` in js/tracker.php

// Refer to README.md for build instructions when minifying this file for distribution.

/*
 * Browser [In]Compatibility
 * - minimum required ECMAScript: ECMA-262, edition 3
 *
 * Incompatible with these (and earlier) versions of:
 * - IE4 - try..catch and for..in introduced in IE5
 * - IE5 - named anonymous functions, array.push, encodeURIComponent, decodeURIComponent, and getElementsByTagName introduced in IE5.5
 * - IE6 and 7 - window.JSON introduced in IE8
 * - Firefox 1.0 and Netscape 8.x - FF1.5 adds array.indexOf, among other things
 * - Mozilla 1.7 and Netscape 6.x-7.x
 * - Netscape 4.8
 * - Opera 6 - Error object (and Presto) introduced in Opera 7
 * - Opera 7
 */

/* startjslint */
/*jslint browser:true, plusplus:true, vars:true, nomen:true, evil:true, regexp: false, bitwise: true, white: true */
/*global window */
/*global unescape */
/*global ActiveXObject */
/*global Blob */
/*members Piwik, Matomo, encodeURIComponent, decodeURIComponent, getElementsByTagName,
    shift, unshift, piwikAsyncInit, matomoAsyncInit, matomoPluginAsyncInit , frameElement, self, hasFocus,
    createElement, appendChild, characterSet, charset, all, piwik_log, AnalyticsTracker,
    addEventListener, attachEvent, removeEventListener, detachEvent, disableCookies, setCookieConsentGiven,
    areCookiesEnabled, getRememberedCookieConsent, rememberCookieConsentGiven, forgetCookieConsentGiven, requireCookieConsent,
    cookie, domain, readyState, documentElement, doScroll, title, text, contentWindow, postMessage,
    location, top, onerror, document, referrer, parent, links, href, protocol, name,
    performance, mozPerformance, msPerformance, webkitPerformance, timing, getEntriesByType, connectEnd, requestStart,
    responseStart, responseEnd, fetchStart, domInteractive, domLoading, domComplete, loadEventStart, loadEventEnd,
    event, which, button, srcElement, type, target, data,
    parentNode, tagName, hostname, className,
    userAgent, cookieEnabled, sendBeacon, platform, mimeTypes, enabledPlugin, javaEnabled,
    userAgentData, getHighEntropyValues, brands, uaFullVersion, fullVersionList,
    serviceWorker, ready, then, sync, register,
    XMLHttpRequest, ActiveXObject, open, setRequestHeader, onreadystatechange, send, readyState, status,
    getTime, getTimeAlias, setTime, toGMTString, getHours, getMinutes, getSeconds,
    toLowerCase, toUpperCase, charAt, indexOf, lastIndexOf, split, slice,
    onload, src,
    min, round, random, floor,
    exec, success, trackerUrl, isSendBeacon, xhr,
    res, width, height,
    pdf, qt, realp, wma, fla, java, ag, showModalDialog,
    _rcn, _rck, _refts, _ref,
    maq_initial_value, maq_opted_in, maq_optout_by_default, maq_url,
    initialized, hook, getHook, resetUserId, getVisitorId, getVisitorInfo, setUserId, getUserId, setSiteId, getSiteId, setTrackerUrl, getTrackerUrl, appendToTrackingUrl, getRequest, addPlugin,
    getAttributionInfo, getAttributionCampaignName, getAttributionCampaignKeyword,
    getAttributionReferrerTimestamp, getAttributionReferrerUrl,
    setCustomData, getCustomData,
    setCustomRequestProcessing,
    setCustomVariable, getCustomVariable, deleteCustomVariable, storeCustomVariablesInCookie, setCustomDimension, getCustomDimension,
    deleteCustomVariables, deleteCustomDimension, setDownloadExtensions, addDownloadExtensions, removeDownloadExtensions,
    setDomains, setIgnoreClasses, setRequestMethod, setRequestContentType, setGenerationTimeMs, setPagePerformanceTiming,
    setReferrerUrl, setCustomUrl, setAPIUrl, setDocumentTitle, setPageViewId, getPiwikUrl, getMatomoUrl, getCurrentUrl,
    setExcludedReferrers, getExcludedReferrers,
    setDownloadClasses, setLinkClasses,
    setCampaignNameKey, setCampaignKeywordKey,
    getConsentRequestsQueue, requireConsent, getRememberedConsent, hasRememberedConsent, isConsentRequired,
    setConsentGiven, rememberConsentGiven, forgetConsentGiven, unload, hasConsent,
    discardHashTag, alwaysUseSendBeacon, disableAlwaysUseSendBeacon, isUsingAlwaysUseSendBeacon,
    setCookieNamePrefix, setCookieDomain, setCookiePath, setSecureCookie, setVisitorIdCookie, getCookieDomain, hasCookies, setSessionCookie,
    setVisitorCookieTimeout, setSessionCookieTimeout, setReferralCookieTimeout, getCookie, getCookiePath, getSessionCookieTimeout,
    setExcludedQueryParams, setConversionAttributionFirstReferrer, tracker, request,
    disablePerformanceTracking, maq_confirm_opted_in,
    doNotTrack, setDoNotTrack, msDoNotTrack, getValuesFromVisitorIdCookie,
    enableCrossDomainLinking, disableCrossDomainLinking, isCrossDomainLinkingEnabled, setCrossDomainLinkingTimeout, getCrossDomainLinkingUrlParameter,
    addListener, enableLinkTracking, disableBrowserFeatureDetection, enableBrowserFeatureDetection, enableJSErrorTracking, setLinkTrackingTimer, getLinkTrackingTimer,
    enableHeartBeatTimer, disableHeartBeatTimer, killFrame, redirectFile, setCountPreRendered, setVisitStandardLength,
    trackGoal, trackLink, trackPageView, getNumTrackedPageViews, trackRequest, ping, queueRequest, trackSiteSearch, trackEvent,
    requests, timeout, enabled, sendRequests, queueRequest, canQueue, pushMultiple, disableQueueRequest,setRequestQueueInterval,interval,getRequestQueue, getJavascriptErrors, unsetPageIsUnloading,
    setEcommerceView, getEcommerceItems, addEcommerceItem, removeEcommerceItem, clearEcommerceCart, trackEcommerceOrder, trackEcommerceCartUpdate,
    deleteCookie, deleteCookies, offsetTop, offsetLeft, offsetHeight, offsetWidth, nodeType, defaultView,
    innerHTML, scrollLeft, scrollTop, currentStyle, getComputedStyle, querySelectorAll, splice,
    getAttribute, hasAttribute, attributes, nodeName, findContentNodes, findContentNodes, findContentNodesWithinNode,
    findPieceNode, findTargetNodeNoDefault, findTargetNode, findContentPiece, children, hasNodeCssClass,
    getAttributeValueFromNode, hasNodeAttributeWithValue, hasNodeAttribute, findNodesByTagName, findMultiple,
    makeNodesUnique, concat, find, htmlCollectionToArray, offsetParent, value, nodeValue, findNodesHavingAttribute,
    findFirstNodeHavingAttribute, findFirstNodeHavingAttributeWithValue, getElementsByClassName,
    findNodesHavingCssClass, findFirstNodeHavingClass, isLinkElement, findParentContentNode, removeDomainIfIsInLink,
    findContentName, findMediaUrlInNode, toAbsoluteUrl, findContentTarget, getLocation, origin, host, isSameDomain,
    search, trim, getBoundingClientRect, bottom, right, left, innerWidth, innerHeight, clientWidth, clientHeight,
    isOrWasNodeInViewport, isNodeVisible, buildInteractionRequestParams, buildImpressionRequestParams,
    shouldIgnoreInteraction, setHrefAttribute, setAttribute, buildContentBlock, collectContent, setLocation,
    CONTENT_ATTR, CONTENT_CLASS, LEGACY_CONTENT_CLASS, CONTENT_NAME_ATTR, CONTENT_PIECE_ATTR, CONTENT_PIECE_CLASS, LEGACY_CONTENT_PIECE_CLASS,
    CONTENT_TARGET_ATTR, CONTENT_TARGET_CLASS, LEGACY_CONTENT_TARGET_CLASS, CONTENT_IGNOREINTERACTION_ATTR, CONTENT_IGNOREINTERACTION_CLASS, LEGACY_CONTENT_IGNOREINTERACTION_CLASS,
    trackCallbackOnLoad, trackCallbackOnReady, buildContentImpressionsRequests, wasContentImpressionAlreadyTracked,
    getQuery, getContent, setVisitorId, getContentImpressionsRequestsFromNodes,
    buildContentInteractionRequestNode, buildContentInteractionRequest, buildContentImpressionRequest,
    appendContentInteractionToRequestIfPossible, setupInteractionsTracking, trackContentImpressionClickInteraction,
    internalIsNodeVisible, clearTrackedContentImpressions, getTrackerUrl, trackAllContentImpressions,
    getTrackedContentImpressions, getCurrentlyVisibleContentImpressionsRequestsIfNotTrackedYet,
    contentInteractionTrackingSetupDone, contains, match, pathname, piece, trackContentInteractionNode,
    trackContentInteractionNode, trackContentImpressionsWithinNode, trackContentImpression,
    enableTrackOnlyVisibleContent, trackContentInteraction, clearEnableTrackOnlyVisibleContent, logAllContentBlocksOnPage,
    trackVisibleContentImpressions, isTrackOnlyVisibleContentEnabled, port, isUrlToCurrentDomain, matomoTrackers,
    isNodeAuthorizedToTriggerInteraction, getConfigDownloadExtensions, disableLinkTracking,
    substr, setAnyAttribute, max, abs, childNodes, compareDocumentPosition, body,
    getConfigVisitorCookieTimeout, getRemainingVisitorCookieTimeout, getDomains, getConfigCookiePath,
    getConfigCookieSameSite, getCustomPagePerformanceTiming, setCookieSameSite,
    getConfigIdPageView, newVisitor, uuid, createTs, currentVisitTs,
     "", "\b", "\t", "\n", "\f", "\r", "\"", "\\", apply, call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
    getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, lastIndex, length, parse, prototype, push, replace,
    sort, slice, stringify, test, toJSON, toString, valueOf, objectToJSON, addTracker, removeAllAsyncTrackersButFirst,
    optUserOut, forgetUserOptOut, isUserOptedOut, withCredentials, visibilityState
 */
/*global _paq:true */
/*members push */
/*global Piwik:true */
/*global Matomo:true */
/*members addPlugin, getTracker, getAsyncTracker, getAsyncTrackers, addTracker, trigger, on, off, retryMissedPluginCalls,
          DOM, onLoad, onReady, isNodeVisible, isOrWasNodeVisible, JSON */
/*global Matomo_Overlay_Client */
/*global AnalyticsTracker:true */
/*members initialize */
/*global define */
/*global console */
/*members amd */
/*members error */
/*members log */

// asynchronous tracker (or proxy)
if (typeof _paq !== 'object') {
    _paq = [];
}

// Matomo singleton and namespace
if (typeof window.Matomo !== 'object') {
    window.Matomo = window.Piwik = (function () {
        'use strict';

        /************************************************************
         * Private data
         ************************************************************/

        var expireDateTime,

            /* plugins */
            plugins = {},

            eventHandlers = {},

            /* alias frequently used globals for added minification */
            documentAlias = document,
            navigatorAlias = navigator,
            screenAlias = screen,
            windowAlias = window,

            /* performance timing */
            performanceAlias = windowAlias.performance || windowAlias.mozPerformance || windowAlias.msPerformance || windowAlias.webkitPerformance,

            /* encode */
            encodeWrapper = windowAlias.encodeURIComponent,

            /* decode */
            decodeWrapper = windowAlias.decodeURIComponent,

            /* urldecode */
            urldecode = unescape,

            /* asynchronous tracker */
            asyncTrackers = [],

            /* iterator */
            iterator,

            /* local Matomo */
            Matomo,

            missedPluginTrackerCalls = [],

            coreConsentCounter = 0,
            coreHeartBeatCounter = 0,

            trackerIdCounter = 0,

            isPageUnloading = false;

        /************************************************************
         * Private methods
         ************************************************************/

        /**
         * See https://github.com/matomo-org/matomo/issues/8413
         * To prevent Javascript Error: Uncaught URIError: URI malformed when encoding is not UTF-8. Use this method
         * instead of decodeWrapper if a text could contain any non UTF-8 encoded characters eg
         * a URL like http://apache.matomo/test.html?%F6%E4%FC or a link like
         * <a href="test-with-%F6%E4%FC/story/0">(encoded iso-8859-1 URL)</a>
         */
        function safeDecodeWrapper(url)
        {
            try {
                return decodeWrapper(url);
            } catch (e) {
                return unescape(url);
            }
        }

        /*
         * Is property defined?
         */
        function isDefined(property) {
            // workaround https://github.com/douglascrockford/JSLint/commit/24f63ada2f9d7ad65afc90e6d949f631935c2480
            var propertyType = typeof property;

            return propertyType !== 'undefined';
        }

        /*
         * Is property a function?
         */
        function isFunction(property) {
            return typeof property === 'function';
        }

        /*
         * Is property an object?
         *
         * @return bool Returns true if property is null, an Object, or subclass of Object (i.e., an instanceof String, Date, etc.)
         */
        function isObject(property) {
            return typeof property === 'object';
        }

        /*
         * Is property a string?
         */
        function isString(property) {
            return typeof property === 'string' || property instanceof String;
        }

        /*
         * Is property a string?
         */
        function isNumber(property) {
            return typeof property === 'number' || property instanceof Number;
        }

        /*
         * Is property a string?
         */
        function isNumberOrHasLength(property) {
            return isDefined(property) && (isNumber(property) || (isString(property) && property.length));
        }

        function isObjectEmpty(property)
        {
            if (!property) {
                return true;
            }

            var i;
            for (i in property) {
                if (Object.prototype.hasOwnProperty.call(property, i)) {
                    return false;
                }
            }

            return true;
        }

        /**
         * Logs an error in the console.
         *  Note: it does not generate a JavaScript error, so make sure to also generate an error if needed.
         * @param message
         */
        function logConsoleError(message) {
            // needed to write it this way for jslint
            var consoleType = typeof console;
            if (consoleType !== 'undefined' && console && console.error) {
                console.error(message);
            }
        }

        /*
         * apply wrapper
         *
         * @param array parameterArray An array comprising either:
         *      [ 'methodName', optional_parameters ]
         * or:
         *      [ functionObject, optional_parameters ]
         */
        function apply() {
            var i, j, f, parameterArray, trackerCall;

            for (i = 0; i < arguments.length; i += 1) {
                trackerCall = null;
                if (arguments[i] && arguments[i].slice) {
                    trackerCall = arguments[i].slice();
                }
                parameterArray = arguments[i];
                f = parameterArray.shift();

                var fParts, context;

                var isStaticPluginCall = isString(f) && f.indexOf('::') > 0;
                if (isStaticPluginCall) {
                    // a static method will not be called on a tracker and is not dependent on the existence of a
                    // tracker etc
                    fParts = f.split('::');
                    context = fParts[0];
                    f = fParts[1];

                    if ('object' === typeof Matomo[context] && 'function' === typeof Matomo[context][f]) {
                        Matomo[context][f].apply(Matomo[context], parameterArray);
                    } else if (trackerCall) {
                        // we try to call that method again later as the plugin might not be loaded yet
                        // a plugin can call "Matomo.retryMissedPluginCalls();" once it has been loaded and then the
                        // method call to "Matomo[context][f]" may be executed
                        missedPluginTrackerCalls.push(trackerCall);
                    }

                } else {
                    for (j = 0; j < asyncTrackers.length; j++) {
                        if (isString(f)) {
                            context = asyncTrackers[j];

                            var isPluginTrackerCall = f.indexOf('.') > 0;

                            if (isPluginTrackerCall) {
                                fParts = f.split('.');
                                if (context && 'object' === typeof context[fParts[0]]) {
                                    context = context[fParts[0]];
                                    f = fParts[1];
                                } else if (trackerCall) {
                                    // we try to call that method again later as the plugin might not be loaded yet
                                    missedPluginTrackerCalls.push(trackerCall);
                                    break;
                                }
                            }

                            if (context[f]) {
                                context[f].apply(context, parameterArray);
                            } else {
                                var message = 'The method \'' + f + '\' was not found in "_paq" variable.  Please have a look at the Matomo tracker documentation: https://developer.matomo.org/api-reference/tracking-javascript';
                                logConsoleError(message);

                                if (!isPluginTrackerCall) {
                                    // do not trigger an error if it is a call to a plugin as the plugin may just not be
                                    // loaded yet etc
                                    throw new TypeError(message);
                                }
                            }

                            if (f === 'addTracker') {
                                // addTracker adds an entry to asyncTrackers and would otherwise result in an endless loop
                                break;
                            }

                            if (f === 'setTrackerUrl' || f === 'setSiteId') {
                                // these two methods should be only executed on the first tracker
                                break;
                            }
                        } else {
                            f.apply(asyncTrackers[j], parameterArray);
                        }
                    }
                }
            }
        }

        /*
         * Cross-browser helper function to add event handler
         */
        function addEventListener(element, eventType, eventHandler, useCapture) {
            if (element.addEventListener) {
                element.addEventListener(eventType, eventHandler, useCapture);

                return true;
            }

            if (element.attachEvent) {
                return element.attachEvent('on' + eventType, eventHandler);
            }

            element['on' + eventType] = eventHandler;
        }

        function trackCallbackOnLoad(callback)
        {
            if (documentAlias.readyState === 'complete') {
                callback();
            } else if (windowAlias.addEventListener) {
                windowAlias.addEventListener('load', callback, false);
            } else if (windowAlias.attachEvent) {
                windowAlias.attachEvent('onload', callback);
            }
        }

        function trackCallbackOnReady(callback)
        {
            var loaded = false;

            if (documentAlias.attachEvent) {
                loaded = documentAlias.readyState === 'complete';
            } else {
                loaded = documentAlias.readyState !== 'loading';
            }

            if (loaded) {
                callback();
                return;
            }

            var _timer;

            if (documentAlias.addEventListener) {
                addEventListener(documentAlias, 'DOMContentLoaded', function ready() {
                    documentAlias.removeEventListener('DOMContentLoaded', ready, false);
                    if (!loaded) {
                        loaded = true;
                        callback();
                    }
                });
            } else if (documentAlias.attachEvent) {
                documentAlias.attachEvent('onreadystatechange', function ready() {
                    if (documentAlias.readyState === 'complete') {
                        documentAlias.detachEvent('onreadystatechange', ready);
                        if (!loaded) {
                            loaded = true;
                            callback();
                        }
                    }
                });

                if (documentAlias.documentElement.doScroll && windowAlias === windowAlias.top) {
                    (function ready() {
                        if (!loaded) {
                            try {
                                documentAlias.documentElement.doScroll('left');
                            } catch (error) {
                                setTimeout(ready, 0);

                                return;
                            }
                            loaded = true;
                            callback();
                        }
                    }());
                }
            }

            // fallback
            addEventListener(windowAlias, 'load', function () {
                if (!loaded) {
                    loaded = true;
                    callback();
                }
            }, false);
        }

        /*
         * Call plugin hook methods
         */
        function executePluginMethod(methodName, params, callback) {
            if (!methodName) {
                return '';
            }

            var result = '',
                i,
                pluginMethod, value, isFunction;

            for (i in plugins) {
                if (Object.prototype.hasOwnProperty.call(plugins, i)) {
                    isFunction = plugins[i] && 'function' === typeof plugins[i][methodName];

                    if (isFunction) {
                        pluginMethod = plugins[i][methodName];
                        value = pluginMethod(params || {}, callback);

                        if (value) {
                            result += value;
                        }
                    }
                }
            }

            return result;
        }

        /*
         * Handle beforeunload event
         *
         * Subject to Safari's "Runaway JavaScript Timer" and
         * Chrome V8 extension that terminates JS that exhibits
         * "slow unload", i.e., calling getTime() > 1000 times
         */
        function beforeUnloadHandler(event) {
            var now;
            isPageUnloading = true;

            executePluginMethod('unload');
            now = new Date();
            var aliasTime = now.getTimeAlias();
            if ((expireDateTime - aliasTime) > 3000) {
                expireDateTime = aliasTime + 3000;
            }

            /*
             * Delay/pause (blocks UI)
             */
            if (expireDateTime) {
                // the things we do for backwards compatibility...
                // in ECMA-262 5th ed., we could simply use:
                //     while (Date.now() < expireDateTime) { }
                do {
                    now = new Date();
                } while (now.getTimeAlias() < expireDateTime);
            }
        }

        /*
         * Load JavaScript file (asynchronously)
         */
        function loadScript(src, onLoad) {
            var script = documentAlias.createElement('script');

            script.type = 'text/javascript';
            script.src = src;

            if (script.readyState) {
                script.onreadystatechange = function () {
                    var state = this.readyState;

                    if (state === 'loaded' || state === 'complete') {
                        script.onreadystatechange = null;
                        onLoad();
                    }
                };
            } else {
                script.onload = onLoad;
            }

            documentAlias.getElementsByTagName('head')[0].appendChild(script);
        }

        /*
         * Get page referrer
         */
        function getReferrer() {
            var referrer = '';

            try {
                referrer = windowAlias.top.document.referrer;
            } catch (e) {
                if (windowAlias.parent) {
                    try {
                        referrer = windowAlias.parent.document.referrer;
                    } catch (e2) {
                        referrer = '';
                    }
                }
            }

            if (referrer === '') {
                referrer = documentAlias.referrer;
            }

            return referrer;
        }

        /*
         * Extract scheme/protocol from URL
         */
        function getProtocolScheme(url) {
            var e = new RegExp('^([a-z]+):'),
                matches = e.exec(url);

            return matches ? matches[1] : null;
        }

        /*
         * Extract hostname from URL
         */
        function getHostName(url) {
            // scheme : // [username [: password] @] hostame [: port] [/ [path] [? query] [# fragment]]
            var e = new RegExp('^(?:(?:https?|ftp):)/*(?:[^@]+@)?([^:/#]+)'),
                matches = e.exec(url);

            return matches ? matches[1] : url;
        }
        function isPositiveNumberString(str) {
            // !isNaN(str) could be used but does not cover '03' (octal) and '0xA' (hex)
            // nor negative numbers
            return (/^[0-9][0-9]*(\.[0-9]+)?$/).test(str);
        }
        function filterIn(object, byFunction) {
            var result = {}, k;
            for (k in object) {
                if (object.hasOwnProperty(k) && byFunction(object[k])) {
                    result[k] = object[k];
                }
            }
            return result;
        }
        function onlyPositiveIntegers(data) {
            var result = {}, k;
            for (k in data) {
                if (data.hasOwnProperty(k)) {
                    if (isPositiveNumberString(data[k])) {
                        result[k] = Math.round(data[k]);
                    } else {
                        throw new Error('Parameter "' + k + '" provided value "' + data[k] +
                            '" is not valid. Please provide a numeric value.');
                    }
                }
            }
            return result;
        }
        function queryStringify(data) {
            var queryString = '', k;
            for (k in data) {
                if (data.hasOwnProperty(k)) {
                    queryString += '&' + encodeWrapper(k) + '=' + encodeWrapper(data[k]);
                }
            }
            return queryString;
        }

        function stringStartsWith(str, prefix) {
            str = String(str);
            return str.lastIndexOf(prefix, 0) === 0;
        }

        function stringEndsWith(str, suffix) {
            str = String(str);
            return str.indexOf(suffix, str.length - suffix.length) !== -1;
        }

        function stringContains(str, needle) {
            str = String(str);
            return str.indexOf(needle) !== -1;
        }

        function removeCharactersFromEndOfString(str, numCharactersToRemove) {
            str = String(str);
            return str.substr(0, str.length - numCharactersToRemove);
        }

        /**
         * We do not check whether URL contains already url parameter, please use removeUrlParameter() if needed
         * before calling this method.
         * This method makes sure to append URL parameters before a possible hash. Will escape (encode URI component)
         * the set name and value
         */
        function addUrlParameter(url, name, value) {
            url = String(url);

            if (!value) {
                value = '';
            }

            var hashPos = url.indexOf('#');
            var urlLength = url.length;

            if (hashPos === -1) {
                hashPos = urlLength;
            }

            var baseUrl = url.substr(0, hashPos);
            var urlHash = url.substr(hashPos, urlLength - hashPos);

            if (baseUrl.indexOf('?') === -1) {
                baseUrl += '?';
            } else if (!stringEndsWith(baseUrl, '?')) {
                baseUrl += '&';
            }
            // nothing to if ends with ?

            return baseUrl + encodeWrapper(name) + '=' + encodeWrapper(value) + urlHash;
        }

        function removeUrlParameter(url, name) {
            url = String(url);

            if (url.indexOf('?' + name + '=') === -1 && url.indexOf('&' + name + '=') === -1) {
                // nothing to remove, url does not contain this parameter
                return url;
            }

            var searchPos = url.indexOf('?');
            if (searchPos === -1) {
                // nothing to remove, no query parameters
                return url;
            }

            var queryString = url.substr(searchPos + 1);
            var baseUrl = url.substr(0, searchPos);

            if (queryString) {
                var urlHash = '';
                var hashPos = queryString.indexOf('#');
                if (hashPos !== -1) {
                    urlHash = queryString.substr(hashPos + 1);
                    queryString = queryString.substr(0, hashPos);
                }

                var param;
                var paramsArr = queryString.split('&');
                var i = paramsArr.length - 1;

                for (i; i >= 0; i--) {
                    param = paramsArr[i].split('=')[0];
                    if (param === name) {
                        paramsArr.splice(i, 1);
                    }
                }

                var newQueryString = paramsArr.join('&');

                if (newQueryString) {
                    baseUrl = baseUrl + '?' + newQueryString;
                }

                if (urlHash) {
                    baseUrl += '#' + urlHash;
                }
            }

            return baseUrl;
        }

        /*
         * Extract parameter from URL
         */
        function getUrlParameter(url, name) {
            var regexSearch = "[\\?&#]" + name + "=([^&#]*)";
            var regex = new RegExp(regexSearch);
            var results = regex.exec(url);
            return results ? safeDecodeWrapper(results[1]) : '';
        }

        function trim(text)
        {
            if (text && String(text) === text) {
                return text.replace(/^\s+|\s+$/g, '');
            }

            return text;
        }

        /*
         * UTF-8 encoding
         */
        function utf8_encode(argString) {
            return unescape(encodeWrapper(argString));
        }

        /************************************************************
         * sha1
         * - based on sha1 from http://phpjs.org/functions/sha1:512 (MIT / GPL v2)
         ************************************************************/

        function sha1(str) {
            // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
            // + namespaced by: Michael White (http://getsprink.com)
            // +      input by: Brett Zamir (http://brett-zamir.me)
            // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
            // +   jslinted by: Anthon Pang (https://matomo.org)

            var
                rotate_left = function (n, s) {
                    return (n << s) | (n >>> (32 - s));
                },

                cvt_hex = function (val) {
                    var strout = '',
                        i,
                        v;

                    for (i = 7; i >= 0; i--) {
                        v = (val >>> (i * 4)) & 0x0f;
                        strout += v.toString(16);
                    }

                    return strout;
                },

                blockstart,
                i,
                j,
                W = [],
                H0 = 0x67452301,
                H1 = 0xEFCDAB89,
                H2 = 0x98BADCFE,
                H3 = 0x10325476,
                H4 = 0xC3D2E1F0,
                A,
                B,
                C,
                D,
                E,
                temp,
                str_len,
                word_array = [];

            str = utf8_encode(str);
            str_len = str.length;

            for (i = 0; i < str_len - 3; i += 4) {
                j = str.charCodeAt(i) << 24 | str.charCodeAt(i + 1) << 16 |
                    str.charCodeAt(i + 2) << 8 | str.charCodeAt(i + 3);
                word_array.push(j);
            }

            switch (str_len & 3) {
                case 0:
                    i = 0x080000000;
                    break;
                case 1:
                    i = str.charCodeAt(str_len - 1) << 24 | 0x0800000;
                    break;
                case 2:
                    i = str.charCodeAt(str_len - 2) << 24 | str.charCodeAt(str_len - 1) << 16 | 0x08000;
                    break;
                case 3:
                    i = str.charCodeAt(str_len - 3) << 24 | str.charCodeAt(str_len - 2) << 16 | str.charCodeAt(str_len - 1) << 8 | 0x80;
                    break;
            }

            word_array.push(i);

            while ((word_array.length & 15) !== 14) {
                word_array.push(0);
            }

            word_array.push(str_len >>> 29);
            word_array.push((str_len << 3) & 0x0ffffffff);

            for (blockstart = 0; blockstart < word_array.length; blockstart += 16) {
                for (i = 0; i < 16; i++) {
                    W[i] = word_array[blockstart + i];
                }

                for (i = 16; i <= 79; i++) {
                    W[i] = rotate_left(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
                }

                A = H0;
                B = H1;
                C = H2;
                D = H3;
                E = H4;

                for (i = 0; i <= 19; i++) {
                    temp = (rotate_left(A, 5) + ((B & C) | (~B & D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
                    E = D;
                    D = C;
                    C = rotate_left(B, 30);
                    B = A;
                    A = temp;
                }

                for (i = 20; i <= 39; i++) {
                    temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
                    E = D;
                    D = C;
                    C = rotate_left(B, 30);
                    B = A;
                    A = temp;
                }

                for (i = 40; i <= 59; i++) {
                    temp = (rotate_left(A, 5) + ((B & C) | (B & D) | (C & D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
                    E = D;
                    D = C;
                    C = rotate_left(B, 30);
                    B = A;
                    A = temp;
                }

                for (i = 60; i <= 79; i++) {
                    temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
                    E = D;
                    D = C;
                    C = rotate_left(B, 30);
                    B = A;
                    A = temp;
                }

                H0 = (H0 + A) & 0x0ffffffff;
                H1 = (H1 + B) & 0x0ffffffff;
                H2 = (H2 + C) & 0x0ffffffff;
                H3 = (H3 + D) & 0x0ffffffff;
                H4 = (H4 + E) & 0x0ffffffff;
            }

            temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);

            return temp.toLowerCase();
        }

        /************************************************************
         * end sha1
         ************************************************************/

        /*
         * Fix-up URL when page rendered from search engine cache or translated page
         */
        function urlFixup(hostName, href, referrer) {
            if (!hostName) {
                hostName = '';
            }

            if (!href) {
                href = '';
            }

            if (hostName === 'translate.googleusercontent.com') {       // Google
                if (referrer === '') {
                    referrer = href;
                }

                href = getUrlParameter(href, 'u');
                hostName = getHostName(href);
            } else if (hostName === 'cc.bingj.com' ||                   // Bing
                hostName === 'webcache.googleusercontent.com' ||    // Google
                hostName.slice(0, 5) === '74.6.') {                 // Yahoo (via Inktomi 74.6.0.0/16)
                href = documentAlias.links[0].href;
                hostName = getHostName(href);
            }

            return [hostName, href, referrer];
        }

        /*
         * Fix-up domain
         */
        function domainFixup(domain) {
            var dl = domain.length;

            // remove trailing '.'
            if (domain.charAt(--dl) === '.') {
                domain = domain.slice(0, dl);
            }

            // remove leading '*'
            if (domain.slice(0, 2) === '*.') {
                domain = domain.slice(1);
            }

            if (domain.indexOf('/') !== -1) {
                domain = domain.substr(0, domain.indexOf('/'));
            }

            return domain;
        }

        /*
         * Title fixup
         */
        function titleFixup(title) {
            title = title && title.text ? title.text : title;

            if (!isString(title)) {
                var tmp = documentAlias.getElementsByTagName('title');

                if (tmp && isDefined(tmp[0])) {
                    title = tmp[0].text;
                }
            }

            return title;
        }

        function getChildrenFromNode(node)
        {
            if (!node) {
                return [];
            }

            if (!isDefined(node.children) && isDefined(node.childNodes)) {
                return node.children;
            }

            if (isDefined(node.children)) {
                return node.children;
            }

            return [];
        }

        function containsNodeElement(node, containedNode)
        {
            if (!node || !containedNode) {
                return false;
            }

            if (node.contains) {
                return node.contains(containedNode);
            }

            if (node === containedNode) {
                return true;
            }

            if (node.compareDocumentPosition) {
                return !!(node.compareDocumentPosition(containedNode) & 16);
            }

            return false;
        }

        // Polyfill for IndexOf for IE6-IE8
        function indexOfArray(theArray, searchElement)
        {
            if (theArray && theArray.indexOf) {
                return theArray.indexOf(searchElement);
            }

            // 1. Let O be the result of calling ToObject passing
            //    the this value as the argument.
            if (!isDefined(theArray) || theArray === null) {
                return -1;
            }

            if (!theArray.length) {
                return -1;
            }

            var len = theArray.length;

            if (len === 0) {
                return -1;
            }

            var k = 0;

            // 9. Repeat, while k < len
            while (k < len) {
                // a. Let Pk be ToString(k).
                //   This is implicit for LHS operands of the in operator
                // b. Let kPresent be the result of calling the
                //    HasProperty internal method of O with argument Pk.
                //   This step can be combined with c
                // c. If kPresent is true, then
                //    i.  Let elementK be the result of calling the Get
                //        internal method of O with the argument ToString(k).
                //   ii.  Let same be the result of applying the
                //        Strict Equality Comparison Algorithm to
                //        searchElement and elementK.
                //  iii.  If same is true, return k.
                if (theArray[k] === searchElement) {
                    return k;
                }
                k++;
            }
            return -1;
        }

        /************************************************************
         * Element Visiblility
         ************************************************************/

        /**
         * Author: Jason Farrell
         * Author URI: http://useallfive.com/
         *
         * Description: Checks if a DOM element is truly visible.
         * Package URL: https://github.com/UseAllFive/true-visibility
         * License: MIT (https://github.com/UseAllFive/true-visibility/blob/master/LICENSE.txt)
         */
        function isVisible(node) {

            if (!node) {
                return false;
            }

            //-- Cross browser method to get style properties:
            function _getStyle(el, property) {
                if (windowAlias.getComputedStyle) {
                    return documentAlias.defaultView.getComputedStyle(el,null)[property];
                }
                if (el.currentStyle) {
                    return el.currentStyle[property];
                }
            }

            function _elementInDocument(element) {
                element = element.parentNode;

                while (element) {
                    if (element === documentAlias) {
                        return true;
                    }
                    element = element.parentNode;
                }
                return false;
            }

            /**
             * Checks if a DOM element is visible. Takes into
             * consideration its parents and overflow.
             *
             * @param (el)      the DOM element to check if is visible
             *
             * These params are optional that are sent in recursively,
             * you typically won't use these:
             *
             * @param (t)       Top corner position number
             * @param (r)       Right corner position number
             * @param (b)       Bottom corner position number
             * @param (l)       Left corner position number
             * @param (w)       Element width number
             * @param (h)       Element height number
             */
            function _isVisible(el, t, r, b, l, w, h) {
                var p = el.parentNode,
                    VISIBLE_PADDING = 1; // has to be visible at least one px of the element

                if (!_elementInDocument(el)) {
                    return false;
                }

                //-- Return true for document node
                if (9 === p.nodeType) {
                    return true;
                }

                //-- Return false if our element is invisible
                if (
                    '0' === _getStyle(el, 'opacity') ||
                    'none' === _getStyle(el, 'display') ||
                    'hidden' === _getStyle(el, 'visibility')
                ) {
                    return false;
                }

                if (!isDefined(t) ||
                    !isDefined(r) ||
                    !isDefined(b) ||
                    !isDefined(l) ||
                    !isDefined(w) ||
                    !isDefined(h)) {
                    t = el.offsetTop;
                    l = el.offsetLeft;
                    b = t + el.offsetHeight;
                    r = l + el.offsetWidth;
                    w = el.offsetWidth;
                    h = el.offsetHeight;
                }

                if (node === el && (0 === h || 0 === w) && 'hidden' === _getStyle(el, 'overflow')) {
                    return false;
                }

                //-- If we have a parent, let's continue:
                if (p) {
                    //-- Check if the parent can hide its children.
                    if (('hidden' === _getStyle(p, 'overflow') || 'scroll' === _getStyle(p, 'overflow'))) {
                        //-- Only check if the offset is different for the parent
                        if (
                            //-- If the target element is to the right of the parent elm
                        l + VISIBLE_PADDING > p.offsetWidth + p.scrollLeft ||
                        //-- If the target element is to the left of the parent elm
                        l + w - VISIBLE_PADDING < p.scrollLeft ||
                        //-- If the target element is under the parent elm
                        t + VISIBLE_PADDING > p.offsetHeight + p.scrollTop ||
                        //-- If the target element is above the parent elm
                        t + h - VISIBLE_PADDING < p.scrollTop
                        ) {
                            //-- Our target element is out of bounds:
                            return false;
                        }
                    }
                    //-- Add the offset parent's left/top coords to our element's offset:
                    if (el.offsetParent === p) {
                        l += p.offsetLeft;
                        t += p.offsetTop;
                    }
                    //-- Let's recursively check upwards:
                    return _isVisible(p, t, r, b, l, w, h);
                }
                return true;
            }

            return _isVisible(node);
        }

        /************************************************************
         * Query
         ************************************************************/

        var query = {
            htmlCollectionToArray: function (foundNodes)
            {
                var nodes = [], index;

                if (!foundNodes || !foundNodes.length) {
                    return nodes;
                }

                for (index = 0; index < foundNodes.length; index++) {
                    nodes.push(foundNodes[index]);
                }

                return nodes;
            },
            find: function (selector)
            {
                // we use querySelectorAll only on document, not on nodes because of its unexpected behavior. See for
                // instance http://stackoverflow.com/questions/11503534/jquery-vs-document-queryselectorall and
                // http://jsfiddle.net/QdMc5/ and http://ejohn.org/blog/thoughts-on-queryselectorall
                if (!document.querySelectorAll || !selector) {
                    return []; // we do not support all browsers
                }

                var foundNodes = document.querySelectorAll(selector);

                return this.htmlCollectionToArray(foundNodes);
            },
            findMultiple: function (selectors)
            {
                if (!selectors || !selectors.length) {
                    return [];
                }

                var index, foundNodes;
                var nodes = [];
                for (index = 0; index < selectors.length; index++) {
                    foundNodes = this.find(selectors[index]);
                    nodes = nodes.concat(foundNodes);
                }

                nodes = this.makeNodesUnique(nodes);

                return nodes;
            },
            findNodesByTagName: function (node, tagName)
            {
                if (!node || !tagName || !node.getElementsByTagName) {
                    return [];
                }

                var foundNodes = node.getElementsByTagName(tagName);

                return this.htmlCollectionToArray(foundNodes);
            },
            makeNodesUnique: function (nodes)
            {
                var copy = [].concat(nodes);
                nodes.sort(function(n1, n2){
                    if (n1 === n2) {
                        return 0;
                    }

                    var index1 = indexOfArray(copy, n1);
                    var index2 = indexOfArray(copy, n2);

                    if (index1 === index2) {
                        return 0;
                    }

                    return index1 > index2 ? -1 : 1;
                });

                if (nodes.length <= 1) {
                    return nodes;
                }

                var index = 0;
                var numDuplicates = 0;
                var duplicates = [];
                var node;

                node = nodes[index++];

                while (node) {
                    if (node === nodes[index]) {
                        numDuplicates = duplicates.push(index);
                    }

                    node = nodes[index++] || null;
                }

                while (numDuplicates--) {
                    nodes.splice(duplicates[numDuplicates], 1);
                }

                return nodes;
            },
            getAttributeValueFromNode: function (node, attributeName)
            {
                if (!this.hasNodeAttribute(node, attributeName)) {
                    return;
                }

                if (node && node.getAttribute) {
                    return node.getAttribute(attributeName);
                }

                if (!node || !node.attributes) {
                    return;
                }

                var typeOfAttr = (typeof node.attributes[attributeName]);
                if ('undefined' === typeOfAttr) {
                    return;
                }

                if (node.attributes[attributeName].value) {
                    return node.attributes[attributeName].value; // nodeValue is deprecated ie Chrome
                }

                if (node.attributes[attributeName].nodeValue) {
                    return node.attributes[attributeName].nodeValue;
                }

                var index;
                var attrs = node.attributes;

                if (!attrs) {
                    return;
                }

                for (index = 0; index < attrs.length; index++) {
                    if (attrs[index].nodeName === attributeName) {
                        return attrs[index].nodeValue;
                    }
                }

                return null;
            },
            hasNodeAttributeWithValue: function (node, attributeName)
            {
                var value = this.getAttributeValueFromNode(node, attributeName);

                return !!value;
            },
            hasNodeAttribute: function (node, attributeName)
            {
                if (node && node.hasAttribute) {
                    return node.hasAttribute(attributeName);
                }

                if (node && node.attributes) {
                    var typeOfAttr = (typeof node.attributes[attributeName]);
                    return 'undefined' !== typeOfAttr;
                }

                return false;
            },
            hasNodeCssClass: function (node, klassName)
            {
                if (node && klassName && node.className) {
                    var classes = typeof node.className === "string" ? node.className.split(' ') : [];
                    if (-1 !== indexOfArray(classes, klassName)) {
                        return true;
                    }
                }

                return false;
            },
            findNodesHavingAttribute: function (nodeToSearch, attributeName, nodes)
            {
                if (!nodes) {
                    nodes = [];
                }

                if (!nodeToSearch || !attributeName) {
                    return nodes;
                }

                var children = getChildrenFromNode(nodeToSearch);

                if (!children || !children.length) {
                    return nodes;
                }

                var index, child;
                for (index = 0; index < children.length; index++) {
                    child = children[index];
                    if (this.hasNodeAttribute(child, attributeName)) {
                        nodes.push(child);
                    }

                    nodes = this.findNodesHavingAttribute(child, attributeName, nodes);
                }

                return nodes;
            },
            findFirstNodeHavingAttribute: function (node, attributeName)
            {
                if (!node || !attributeName) {
                    return;
                }

                if (this.hasNodeAttribute(node, attributeName)) {
                    return node;
                }

                var nodes = this.findNodesHavingAttribute(node, attributeName);

                if (nodes && nodes.length) {
                    return nodes[0];
                }
            },
            findFirstNodeHavingAttributeWithValue: function (node, attributeName)
            {
                if (!node || !attributeName) {
                    return;
                }

                if (this.hasNodeAttributeWithValue(node, attributeName)) {
                    return node;
                }

                var nodes = this.findNodesHavingAttribute(node, attributeName);

                if (!nodes || !nodes.length) {
                    return;
                }

                var index;
                for (index = 0; index < nodes.length; index++) {
                    if (this.getAttributeValueFromNode(nodes[index], attributeName)) {
                        return nodes[index];
                    }
                }
            },
            findNodesHavingCssClass: function (nodeToSearch, className, nodes)
            {
                if (!nodes) {
                    nodes = [];
                }

                if (!nodeToSearch || !className) {
                    return nodes;
                }

                if (nodeToSearch.getElementsByClassName) {
                    var foundNodes = nodeToSearch.getElementsByClassName(className);
                    return this.htmlCollectionToArray(foundNodes);
                }

                var children = getChildrenFromNode(nodeToSearch);

                if (!children || !children.length) {
                    return [];
                }

                var index, child;
                for (index = 0; index < children.length; index++) {
                    child = children[index];
                    if (this.hasNodeCssClass(child, className)) {
                        nodes.push(child);
                    }

                    nodes = this.findNodesHavingCssClass(child, className, nodes);
                }

                return nodes;
            },
            findFirstNodeHavingClass: function (node, className)
            {
                if (!node || !className) {
                    return;
                }

                if (this.hasNodeCssClass(node, className)) {
                    return node;
                }

                var nodes = this.findNodesHavingCssClass(node, className);

                if (nodes && nodes.length) {
                    return nodes[0];
                }
            },
            isLinkElement: function (node)
            {
                if (!node) {
                    return false;
                }

                var elementName      = String(node.nodeName).toLowerCase();
                var linkElementNames = ['a', 'area'];
                var pos = indexOfArray(linkElementNames, elementName);

                return pos !== -1;
            },
            setAnyAttribute: function (node, attrName, attrValue)
            {
                if (!node || !attrName) {
                    return;
                }

                if (node.setAttribute) {
                    node.setAttribute(attrName, attrValue);
                } else {
                    node[attrName] = attrValue;
                }
            }
        };

        /************************************************************
         * Content Tracking
         ************************************************************/

        var content = {
            CONTENT_ATTR: 'data-track-content',
            CONTENT_CLASS: 'matomoTrackContent',
            LEGACY_CONTENT_CLASS: 'piwikTrackContent',
            CONTENT_NAME_ATTR: 'data-content-name',
            CONTENT_PIECE_ATTR: 'data-content-piece',
            CONTENT_PIECE_CLASS: 'matomoContentPiece',
            LEGACY_CONTENT_PIECE_CLASS: 'piwikContentPiece',
            CONTENT_TARGET_ATTR: 'data-content-target',
            CONTENT_TARGET_CLASS: 'matomoContentTarget',
            LEGACY_CONTENT_TARGET_CLASS: 'piwikContentTarget',
            CONTENT_IGNOREINTERACTION_ATTR: 'data-content-ignoreinteraction',
            CONTENT_IGNOREINTERACTION_CLASS: 'matomoContentIgnoreInteraction',
            LEGACY_CONTENT_IGNOREINTERACTION_CLASS: 'piwikContentIgnoreInteraction',
            location: undefined,

            findContentNodes: function ()
            {
                var cssSelector  = '.' + this.CONTENT_CLASS;
                var cssSelector2  = '.' + this.LEGACY_CONTENT_CLASS;
                var attrSelector = '[' + this.CONTENT_ATTR + ']';
                var contentNodes = query.findMultiple([cssSelector, cssSelector2, attrSelector]);

                return contentNodes;
            },
            findContentNodesWithinNode: function (node)
            {
                if (!node) {
                    return [];
                }

                // NOTE: we do not use query.findMultiple here as querySelectorAll would most likely not deliver the result we want

                var nodes1 = query.findNodesHavingCssClass(node, this.CONTENT_CLASS);
                nodes1     = query.findNodesHavingCssClass(node, this.LEGACY_CONTENT_CLASS, nodes1);
                var nodes2 = query.findNodesHavingAttribute(node, this.CONTENT_ATTR);

                if (nodes2 && nodes2.length) {
                    var index;
                    for (index = 0; index < nodes2.length; index++) {
                        nodes1.push(nodes2[index]);
                    }
                }

                if (query.hasNodeAttribute(node, this.CONTENT_ATTR)) {
                    nodes1.push(node);
                } else if (query.hasNodeCssClass(node, this.CONTENT_CLASS)) {
                    nodes1.push(node);
                } else if (query.hasNodeCssClass(node, this.LEGACY_CONTENT_CLASS)) {
                    nodes1.push(node);
                }

                nodes1 = query.makeNodesUnique(nodes1);

                return nodes1;
            },
            findParentContentNode: function (anyNode)
            {
                if (!anyNode) {
                    return;
                }

                var node    = anyNode;
                var counter = 0;

                while (node && node !== documentAlias && node.parentNode) {
                    if (query.hasNodeAttribute(node, this.CONTENT_ATTR)) {
                        return node;
                    }
                    if (query.hasNodeCssClass(node, this.CONTENT_CLASS)) {
                        return node;
                    }
                    if (query.hasNodeCssClass(node, this.LEGACY_CONTENT_CLASS)) {
                        return node;
                    }

                    node = node.parentNode;

                    if (counter > 1000) {
                        break; // prevent loop, should not happen anyway but better we do this
                    }
                    counter++;
                }
            },
            findPieceNode: function (node)
            {
                var contentPiece;

                contentPiece = query.findFirstNodeHavingAttribute(node, this.CONTENT_PIECE_ATTR);

                if (!contentPiece) {
                    contentPiece = query.findFirstNodeHavingClass(node, this.CONTENT_PIECE_CLASS);
                }
                if (!contentPiece) {
                    contentPiece = query.findFirstNodeHavingClass(node, this.LEGACY_CONTENT_PIECE_CLASS);
                }

                if (contentPiece) {
                    return contentPiece;
                }

                return node;
            },
            findTargetNodeNoDefault: function (node)
            {
                if (!node) {
                    return;
                }

                var target = query.findFirstNodeHavingAttributeWithValue(node, this.CONTENT_TARGET_ATTR);
                if (target) {
                    return target;
                }

                target = query.findFirstNodeHavingAttribute(node, this.CONTENT_TARGET_ATTR);
                if (target) {
                    return target;
                }

                target = query.findFirstNodeHavingClass(node, this.CONTENT_TARGET_CLASS);
                if (target) {
                    return target;
                }

                target = query.findFirstNodeHavingClass(node, this.LEGACY_CONTENT_TARGET_CLASS);
                if (target) {
                    return target;
                }
            },
            findTargetNode: function (node)
            {
                var target = this.findTargetNodeNoDefault(node);
                if (target) {
                    return target;
                }

                return node;
            },
            findContentName: function (node)
            {
                if (!node) {
                    return;
                }

                var nameNode = query.findFirstNodeHavingAttributeWithValue(node, this.CONTENT_NAME_ATTR);

                if (nameNode) {
                    return query.getAttributeValueFromNode(nameNode, this.CONTENT_NAME_ATTR);
                }

                var contentPiece = this.findContentPiece(node);
                if (contentPiece) {
                    return this.removeDomainIfIsInLink(contentPiece);
                }

                if (query.hasNodeAttributeWithValue(node, 'title')) {
                    return query.getAttributeValueFromNode(node, 'title');
                }

                var clickUrlNode = this.findPieceNode(node);

                if (query.hasNodeAttributeWithValue(clickUrlNode, 'title')) {
                    return query.getAttributeValueFromNode(clickUrlNode, 'title');
                }

                var targetNode = this.findTargetNode(node);

                if (query.hasNodeAttributeWithValue(targetNode, 'title')) {
                    return query.getAttributeValueFromNode(targetNode, 'title');
                }
            },
            findContentPiece: function (node)
            {
                if (!node) {
                    return;
                }

                var nameNode = query.findFirstNodeHavingAttributeWithValue(node, this.CONTENT_PIECE_ATTR);

                if (nameNode) {
                    return query.getAttributeValueFromNode(nameNode, this.CONTENT_PIECE_ATTR);
                }

                var contentNode = this.findPieceNode(node);

                var media = this.findMediaUrlInNode(contentNode);
                if (media) {
                    return this.toAbsoluteUrl(media);
                }
            },
            findContentTarget: function (node)
            {
                if (!node) {
                    return;
                }

                var targetNode = this.findTargetNode(node);

                if (query.hasNodeAttributeWithValue(targetNode, this.CONTENT_TARGET_ATTR)) {
                    return query.getAttributeValueFromNode(targetNode, this.CONTENT_TARGET_ATTR);
                }

                var href;
                if (query.hasNodeAttributeWithValue(targetNode, 'href')) {
                    href = query.getAttributeValueFromNode(targetNode, 'href');
                    return this.toAbsoluteUrl(href);
                }

                var contentNode = this.findPieceNode(node);

                if (query.hasNodeAttributeWithValue(contentNode, 'href')) {
                    href = query.getAttributeValueFromNode(contentNode, 'href');
                    return this.toAbsoluteUrl(href);
                }
            },
            isSameDomain: function (url)
            {
                if (!url || !url.indexOf) {
                    return false;
                }

                if (0 === url.indexOf(this.getLocation().origin)) {
                    return true;
                }

                var posHost = url.indexOf(this.getLocation().host);
                if (8 >= posHost && 0 <= posHost) {
                    return true;
                }

                return false;
            },
            removeDomainIfIsInLink: function (text)
            {
                // we will only remove if domain === location.origin meaning is not an outlink
                var regexContainsProtocol = '^https?:\/\/[^\/]+';
                var regexReplaceDomain = '^.*\/\/[^\/]+';

                if (text &&
                    text.search &&
                    -1 !== text.search(new RegExp(regexContainsProtocol))
                    && this.isSameDomain(text)) {

                    text = text.replace(new RegExp(regexReplaceDomain), '');
                    if (!text) {
                        text = '/';
                    }
                }

                return text;
            },
            findMediaUrlInNode: function (node)
            {
                if (!node) {
                    return;
                }

                var mediaElements = ['img', 'embed', 'video', 'audio'];
                var elementName   = node.nodeName.toLowerCase();

                if (-1 !== indexOfArray(mediaElements, elementName) &&
                    query.findFirstNodeHavingAttributeWithValue(node, 'src')) {

                    var sourceNode = query.findFirstNodeHavingAttributeWithValue(node, 'src');

                    return query.getAttributeValueFromNode(sourceNode, 'src');
                }

                if (elementName === 'object' &&
                    query.hasNodeAttributeWithValue(node, 'data')) {

                    return query.getAttributeValueFromNode(node, 'data');
                }

                if (elementName === 'object') {
                    var params = query.findNodesByTagName(node, 'param');
                    if (params && params.length) {
                        var index;
                        for (index = 0; index < params.length; index++) {
                            if ('movie' === query.getAttributeValueFromNode(params[index], 'name') &&
                                query.hasNodeAttributeWithValue(params[index], 'value')) {

                                return query.getAttributeValueFromNode(params[index], 'value');
                            }
                        }
                    }

                    var embed = query.findNodesByTagName(node, 'embed');
                    if (embed && embed.length) {
                        return this.findMediaUrlInNode(embed[0]);
                    }
                }
            },
            trim: function (text)
            {
                return trim(text);
            },
            isOrWasNodeInViewport: function (node)
            {
                if (!node || !node.getBoundingClientRect || node.nodeType !== 1) {
                    return true;
                }

                var rect = node.getBoundingClientRect();
                var html = documentAlias.documentElement || {};

                var wasVisible = rect.top < 0;
                if (wasVisible && node.offsetTop) {
                    wasVisible = (node.offsetTop + rect.height) > 0;
                }

                var docWidth = html.clientWidth; // The clientWidth attribute returns the viewport width excluding the size of a rendered scroll bar

                if (windowAlias.innerWidth && docWidth > windowAlias.innerWidth) {
                    docWidth = windowAlias.innerWidth; // The innerWidth attribute must return the viewport width including the size of a rendered scroll bar
                }

                var docHeight = html.clientHeight; // The clientWidth attribute returns the viewport width excluding the size of a rendered scroll bar

                if (windowAlias.innerHeight && docHeight > windowAlias.innerHeight) {
                    docHeight = windowAlias.innerHeight; // The innerWidth attribute must return the viewport width including the size of a rendered scroll bar
                }

                return (
                    (rect.bottom > 0 || wasVisible) &&
                    rect.right  > 0 &&
                    rect.left   < docWidth &&
                    ((rect.top  < docHeight) || wasVisible) // rect.top < 0 we assume user has seen all the ones that are above the current viewport
                );
            },
            isNodeVisible: function (node)
            {
                var isItVisible  = isVisible(node);
                var isInViewport = this.isOrWasNodeInViewport(node);
                return isItVisible && isInViewport;
            },
            buildInteractionRequestParams: function (interaction, name, piece, target)
            {
                var params = '';

                if (interaction) {
                    params += 'c_i='+ encodeWrapper(interaction);
                }
                if (name) {
                    if (params) {
                        params += '&';
                    }
                    params += 'c_n='+ encodeWrapper(name);
                }
                if (piece) {
                    if (params) {
                        params += '&';
                    }
                    params += 'c_p='+ encodeWrapper(piece);
                }
                if (target) {
                    if (params) {
                        params += '&';
                    }
                    params += 'c_t='+ encodeWrapper(target);
                }

                if (params) {
                    params += '&ca=1';
                }

                return params;
            },
            buildImpressionRequestParams: function (name, piece, target)
            {
                var params = 'c_n=' + encodeWrapper(name) +
                    '&c_p=' + encodeWrapper(piece);

                if (target) {
                    params += '&c_t=' + encodeWrapper(target);
                }

                if (params) {
                    params += '&ca=1';
                }

                return params;
            },
            buildContentBlock: function (node)
            {
                if (!node) {
                    return;
                }

                var name   = this.findContentName(node);
                var piece  = this.findContentPiece(node);
                var target = this.findContentTarget(node);

                name   = this.trim(name);
                piece  = this.trim(piece);
                target = this.trim(target);

                return {
                    name: name || 'Unknown',
                    piece: piece || 'Unknown',
                    target: target || ''
                };
            },
            collectContent: function (contentNodes)
            {
                if (!contentNodes || !contentNodes.length) {
                    return [];
                }

                var contents = [];

                var index, contentBlock;
                for (index = 0; index < contentNodes.length; index++) {
                    contentBlock = this.buildContentBlock(contentNodes[index]);
                    if (isDefined(contentBlock)) {
                        contents.push(contentBlock);
                    }
                }

                return contents;
            },
            setLocation: function (location)
            {
                this.location = location;
            },
            getLocation: function ()
            {
                var locationAlias = this.location || windowAlias.location;

                if (!locationAlias.origin) {
                    locationAlias.origin = locationAlias.protocol + "//" + locationAlias.hostname + (locationAlias.port ? ':' + locationAlias.port: '');
                }

                return locationAlias;
            },
            toAbsoluteUrl: function (url)
            {
                if ((!url || String(url) !== url) && url !== '') {
                    // we only handle strings
                    return url;
                }

                if ('' === url) {
                    return this.getLocation().href;
                }

                // Eg //example.com/test.jpg
                if (url.search(/^\/\//) !== -1) {
                    return this.getLocation().protocol + url;
                }

                // Eg http://example.com/test.jpg
                if (url.search(/:\/\//) !== -1) {
                    return url;
                }

                // Eg #test.jpg
                if (0 === url.indexOf('#')) {
                    return this.getLocation().origin + this.getLocation().pathname + url;
                }

                // Eg ?x=5
                if (0 === url.indexOf('?')) {
                    return this.getLocation().origin + this.getLocation().pathname + url;
                }

                // Eg mailto:x@y.z tel:012345, ... market:... sms:..., javascript:... ecmascript: ... and many more
                if (0 === url.search('^[a-zA-Z]{2,11}:')) {
                    return url;
                }

                // Eg /test.jpg
                if (url.search(/^\//) !== -1) {
                    return this.getLocation().origin + url;
                }

                // Eg test.jpg
                var regexMatchDir = '(.*\/)';
                var base = this.getLocation().origin + this.getLocation().pathname.match(new RegExp(regexMatchDir))[0];
                return base + url;
            },
            isUrlToCurrentDomain: function (url) {

                var absoluteUrl = this.toAbsoluteUrl(url);

                if (!absoluteUrl) {
                    return false;
                }

                var origin = this.getLocation().origin;
                if (origin === absoluteUrl) {
                    return true;
                }

                if (0 === String(absoluteUrl).indexOf(origin)) {
                    if (':' === String(absoluteUrl).substr(origin.length, 1)) {
                        return false; // url has port whereas origin has not => different URL
                    }

                    return true;
                }

                return false;
            },
            setHrefAttribute: function (node, url)
            {
                if (!node || !url) {
                    return;
                }

                query.setAnyAttribute(node, 'href', url);
            },
            shouldIgnoreInteraction: function (targetNode)
            {
                if (query.hasNodeAttribute(targetNode, this.CONTENT_IGNOREINTERACTION_ATTR)) {
                    return true;
                }
                if (query.hasNodeCssClass(targetNode, this.CONTENT_IGNOREINTERACTION_CLASS)) {
                    return true;
                }
                if (query.hasNodeCssClass(targetNode, this.LEGACY_CONTENT_IGNOREINTERACTION_CLASS)) {
                    return true;
                }
                return false;
            }
        };

        /************************************************************
         * Page Overlay
         ************************************************************/

        function getMatomoUrlForOverlay(trackerUrl, apiUrl) {
            if (apiUrl) {
                return apiUrl;
            }

            trackerUrl = content.toAbsoluteUrl(trackerUrl);

            // if eg http://www.example.com/js/tracker.php?version=232323 => http://www.example.com/js/tracker.php
            if (stringContains(trackerUrl, '?')) {
                var posQuery = trackerUrl.indexOf('?');
                trackerUrl   = trackerUrl.slice(0, posQuery);
            }

            if (stringEndsWith(trackerUrl, 'matomo.php')) {
                // if eg without domain or path "matomo.php" => ''
                trackerUrl = removeCharactersFromEndOfString(trackerUrl, 'matomo.php'.length);
            } else if (stringEndsWith(trackerUrl, 'piwik.php')) {
                // if eg without domain or path "piwik.php" => ''
                trackerUrl = removeCharactersFromEndOfString(trackerUrl, 'piwik.php'.length);
            } else if (stringEndsWith(trackerUrl, '.php')) {
                // if eg http://www.example.com/js/matomo.php => http://www.example.com/js/
                // or if eg http://www.example.com/tracker.php => http://www.example.com/
                var lastSlash = trackerUrl.lastIndexOf('/');
                var includeLastSlash = 1;
                trackerUrl = trackerUrl.slice(0, lastSlash + includeLastSlash);
            }

            // if eg http://www.example.com/js/ => http://www.example.com/ (when not minified Matomo JS loaded)
            if (stringEndsWith(trackerUrl, '/js/')) {
                trackerUrl = removeCharactersFromEndOfString(trackerUrl, 'js/'.length);
            }

            // http://www.example.com/
            return trackerUrl;
        }

        /*
         * Check whether this is a page overlay session
         *
         * @return boolean
         *
         * {@internal side-effect: modifies window.name }}
         */
        function isOverlaySession(configTrackerSiteId) {
            var windowName = 'Matomo_Overlay';

            // check whether we were redirected from the matomo overlay plugin
            var referrerRegExp = new RegExp('index\\.php\\?module=Overlay&action=startOverlaySession'
                + '&idSite=([0-9]+)&period=([^&]+)&date=([^&]+)(&segment=[^&]*)?');

            var match = referrerRegExp.exec(documentAlias.referrer);

            if (match) {
                // check idsite
                var idsite = match[1];

                if (idsite !== String(configTrackerSiteId)) {
                    return false;
                }

                // store overlay session info in window name
                var period = match[2],
                    date = match[3],
                    segment = match[4];

                if (!segment) {
                    segment = '';
                } else if (segment.indexOf('&segment=') === 0) {
                    segment = segment.substr('&segment='.length);
                }

                windowAlias.name = windowName + '###' + period + '###' + date + '###' + segment;
            }

            // retrieve and check data from window name
            var windowNameParts = windowAlias.name.split('###');

            return windowNameParts.length === 4 && windowNameParts[0] === windowName;
        }

        /*
         * Inject the script needed for page overlay
         */
        function injectOverlayScripts(configTrackerUrl, configApiUrl, configTrackerSiteId) {
            var windowNameParts = windowAlias.name.split('###'),
                period = windowNameParts[1],
                date = windowNameParts[2],
                segment = windowNameParts[3],
                matomoUrl = getMatomoUrlForOverlay(configTrackerUrl, configApiUrl);

            loadScript(
                matomoUrl + 'plugins/Overlay/client/client.js?v=1',
                function () {
                    Matomo_Overlay_Client.initialize(matomoUrl, configTrackerSiteId, period, date, segment);
                }
            );
        }

        function isInsideAnIframe () {
            var frameElement;

            try {
                // If the parent window has another origin, then accessing frameElement
                // throws an Error in IE. see issue #10105.
                frameElement = windowAlias.frameElement;
            } catch(e) {
                // When there was an Error, then we know we are inside an iframe.
                return true;
            }

            if (isDefined(frameElement)) {
                return (frameElement && String(frameElement.nodeName).toLowerCase() === 'iframe') ? true : false;
            }

            try {
                return windowAlias.self !== windowAlias.top;
            } catch (e2) {
                return true;
            }
        }

        /************************************************************
         * End Page Overlay
         ************************************************************/

        /*
         * Matomo Tracker class
         *
         * trackerUrl and trackerSiteId are optional arguments to the constructor
         *
         * See: Tracker.setTrackerUrl() and Tracker.setSiteId()
         */
        function Tracker(trackerUrl, siteId) {

            /************************************************************
             * Private members
             ************************************************************/

            var
                /*<DEBUG>*/
                /*
                 * registered test hooks
                 */
                registeredHooks = {},
                /*</DEBUG>*/

                trackerInstance = this,

                // constants
                CONSENT_COOKIE_NAME = 'mtm_consent',
                COOKIE_CONSENT_COOKIE_NAME = 'mtm_cookie_consent',
                CONSENT_REMOVED_COOKIE_NAME = 'mtm_consent_removed',

                // Current URL and Referrer URL
                locationArray = urlFixup(documentAlias.domain, windowAlias.location.href, getReferrer()),
                domainAlias = domainFixup(locationArray[0]),
                locationHrefAlias = safeDecodeWrapper(locationArray[1]),
                configReferrerUrl = safeDecodeWrapper(locationArray[2]),

                enableJSErrorTracking = false,

                defaultRequestMethod = 'GET',

                // Request method (GET or POST)
                configRequestMethod = defaultRequestMethod,

                defaultRequestContentType = 'application/x-www-form-urlencoded; charset=UTF-8',

                // Request Content-Type header value; applicable when POST request method is used for submitting tracking events
                configRequestContentType = defaultRequestContentType,

                // Tracker URL
                configTrackerUrl = trackerUrl || '',

                // API URL (only set if it differs from the Tracker URL)
                configApiUrl = '',

                // This string is appended to the Tracker URL Request (eg. to send data that is not handled by the existing setters/getters)
                configAppendToTrackingUrl = '',

                // setPagePerformanceTiming sets this manually for SPAs
                customPagePerformanceTiming = '',

                // Site ID
                configTrackerSiteId = siteId || '',

                // User ID
                configUserId = '',

                // Visitor UUID
                visitorUUID = '',

                // Document URL
                configCustomUrl,

                // Document title
                configTitle = '',

                // Extensions to be treated as download links
                configDownloadExtensions = ['7z','aac','apk','arc','arj','asf','asx','avi','azw3','bin','csv','deb','dmg','doc','docx','epub','exe','flv','gif','gz','gzip','hqx','ibooks','jar','jpg','jpeg','js','mobi','mp2','mp3','mp4','mpg','mpeg','mov','movie','msi','msp','odb','odf','odg','ods','odt','ogg','ogv','pdf','phps','png','ppt','pptx','qt','qtm','ra','ram','rar','rpm','rtf','sea','sit','tar','tbz','tbz2','bz','bz2','tgz','torrent','txt','wav','wma','wmv','wpd','xls','xlsx','xml','z','zip'],

                // Hosts or alias(es) to not treat as outlinks
                configHostsAlias = [domainAlias],

                // HTML anchor element classes to not track
                configIgnoreClasses = [],

                // Referrer URLs that should be excluded
                configExcludedReferrers = ['.paypal.com'],

                // Query parameters to be excluded
                configExcludedQueryParams = [],

                // HTML anchor element classes to treat as downloads
                configDownloadClasses = [],

                // HTML anchor element classes to treat at outlinks
                configLinkClasses = [],

                // Maximum delay to wait for web bug image to be fetched (in milliseconds)
                configTrackerPause = 500,

                // If enabled, always use sendBeacon if the browser supports it
                configAlwaysUseSendBeacon = true,

                // Minimum visit time after initial page view (in milliseconds)
                configMinimumVisitTime,

                // Recurring heart beat after initial ping (in milliseconds)
                configHeartBeatDelay,

                // alias to circumvent circular function dependency (JSLint requires this)
                heartBeatPingIfActivityAlias,

                // Disallow hash tags in URL
                configDiscardHashTag,

                // Custom data
                configCustomData,

                // Campaign names
                configCampaignNameParameters = [ 'pk_campaign', 'mtm_campaign', 'piwik_campaign', 'matomo_campaign', 'utm_campaign', 'utm_source', 'utm_medium' ],

                // Campaign keywords
                configCampaignKeywordParameters = [ 'pk_kwd', 'mtm_kwd', 'piwik_kwd', 'matomo_kwd', 'utm_term' ],

                // First-party cookie name prefix
                configCookieNamePrefix = '_pk_',

                // the URL parameter that will store the visitorId if cross domain linking is enabled
                // pk_vid = visitor ID
                // first part of this URL parameter will be 16 char visitor Id.
                // The second part is the 10 char current timestamp and the third and last part will be a 6 characters deviceId
                // timestamp is needed to prevent reusing the visitorId when the URL is shared. The visitorId will be
                // only reused if the timestamp is less than 45 seconds old.
                // deviceId parameter is needed to prevent reusing the visitorId when the URL is shared. The visitorId
                // will be only reused if the device is still the same when opening the link.
                // VDI = visitor device identifier
                configVisitorIdUrlParameter = 'pk_vid',

                // Cross domain linking, the visitor ID is transmitted only in the 180 seconds following the click.
                configVisitorIdUrlParameterTimeoutInSeconds = 180,

                // First-party cookie domain
                // User agent defaults to origin hostname
                configCookieDomain,

                // First-party cookie path
                // Default is user agent defined.
                configCookiePath,

                // Whether to use "Secure" cookies that only work over SSL
                configCookieIsSecure = false,

                // Set SameSite attribute for cookies
                configCookieSameSite = 'Lax',

                // First-party cookies are disabled
                configCookiesDisabled = false,

                // Do Not Track
                configDoNotTrack,

                // Count sites which are pre-rendered
                configCountPreRendered,

                // Do we attribute the conversion to the first referrer or the most recent referrer?
                configConversionAttributionFirstReferrer,

                // Life of the visitor cookie (in milliseconds)
                configVisitorCookieTimeout = 33955200000, // 13 months (365 days + 28days)

                // Life of the session cookie (in milliseconds)
                configSessionCookieTimeout = 1800000, // 30 minutes

                // Life of the referral cookie (in milliseconds)
                configReferralCookieTimeout = 15768000000, // 6 months

                // Is performance tracking enabled
                configPerformanceTrackingEnabled = true,

                // will be set to true automatically once the onload event has finished
                performanceAvailable = false,

                // indicates if performance metrics for the page view have been sent with a request
                performanceTracked = false,

                // Whether Custom Variables scope "visit" should be stored in a cookie during the time of the visit
                configStoreCustomVariablesInCookie = false,

                // Custom Variables read from cookie, scope "visit"
                customVariables = false,

                configCustomRequestContentProcessing,

                // Custom Variables, scope "page"
                customVariablesPage = {},

                // Custom Variables, scope "event"
                customVariablesEvent = {},

                // Custom Dimensions (can be any scope)
                customDimensions = {},

                // Custom Variables names and values are each truncated before being sent in the request or recorded in the cookie
                customVariableMaximumLength = 200,

                // Ecommerce product view
                ecommerceProductView = {},

                // Ecommerce items
                ecommerceItems = {},

                // Browser features via client-side data collection
                browserFeatures = {},

                // Browser client hints
                clientHints = {},
                clientHintsRequestQueue = [],
                clientHintsResolved = false,

                // Keeps track of previously tracked content impressions
                trackedContentImpressions = [],
                isTrackOnlyVisibleContentEnabled = false,

                // Guard to prevent empty visits see #6415. If there is a new visitor and the first 2 (or 3 or 4)
                // tracking requests are at nearly same time (eg trackPageView and trackContentImpression) 2 or more
                // visits will be created
                timeNextTrackingRequestCanBeExecutedImmediately = false,

                // Guard against installing the link tracker more than once per Tracker instance
                linkTrackingInstalled = false,
                linkTrackingEnabled = false,
                crossDomainTrackingEnabled = false,

                // Guard against installing the activity tracker more than once per Tracker instance
                heartBeatSetUp = false,

                // bool used to detect whether this browser window had focus at least once. So far we cannot really
                // detect this 100% correct for an iframe so whenever Matomo is loaded inside an iframe we presume
                // the window had focus at least once.
                hadWindowFocusAtLeastOnce = isInsideAnIframe(),
                timeWindowLastFocused = null,

                // Timestamp of last tracker request sent to Matomo
                lastTrackerRequestTime = null,

                // Internal state of the pseudo click handler
                lastButton,
                lastTarget,

                // Hash function
                hash = sha1,

                // Domain hash value
                domainHash,

                configIdPageView,

                // Boolean indicating that a page view ID has been set manually
                configIdPageViewSetManually = false,

                // we measure how many pageviews have been tracked so plugins can use it to eg detect if a
                // pageview was already tracked or not
                numTrackedPageviews = 0,

                configCookiesToDelete = ['id', 'ses', 'cvar', 'ref'],

                // whether requireConsent() was called or not
                configConsentRequired = false,

                // we always have the concept of consent. by default consent is assumed unless the end user removes it,
                // or unless a matomo user explicitly requires consent (via requireConsent())
                configHasConsent = null, // initialized below

                // holds all pending tracking requests that have not been tracked because we need consent
                consentRequestsQueue = [],

                // holds the actual javascript errors if enableJSErrorTracking is on, if the very same error is
                // happening multiple times, then it will be tracked only once within the same page view
                javaScriptErrors = [],

                // a unique ID for this tracker during this request
                uniqueTrackerId = trackerIdCounter++,

                // whether a tracking request has been sent yet during this page view
                hasSentTrackingRequestYet = false,

                configBrowserFeatureDetection = true;

            // Document title
            try {
                configTitle = documentAlias.title;
            } catch(e) {
                configTitle = '';
            }

            /*
             * Get cookie value
             */
            function getCookie(cookieName) {
                if (configCookiesDisabled && cookieName !== CONSENT_REMOVED_COOKIE_NAME) {
                    return 0;
                }

                var cookiePattern = new RegExp('(^|;)[ ]*' + cookieName + '=([^;]*)'),
                    cookieMatch = cookiePattern.exec(documentAlias.cookie);

                return cookieMatch ? decodeWrapper(cookieMatch[2]) : 0;
            }

            configHasConsent = !getCookie(CONSENT_REMOVED_COOKIE_NAME);

            /*
             * Set cookie value
             */
            function setCookie(cookieName, value, msToExpire, path, domain, isSecure, sameSite) {
                if (configCookiesDisabled && cookieName !== CONSENT_REMOVED_COOKIE_NAME) {
                    return;
                }

                var expiryDate;

                // relative time to expire in milliseconds
                if (msToExpire) {
                    expiryDate = new Date();
                    expiryDate.setTime(expiryDate.getTime() + msToExpire);
                }

                if (!sameSite) {
                    sameSite = 'Lax';
                }

                documentAlias.cookie = cookieName + '=' + encodeWrapper(value) +
                    (msToExpire ? ';expires=' + expiryDate.toGMTString() : '') +
                    ';path=' + (path || '/') +
                    (domain ? ';domain=' + domain : '') +
                    (isSecure ? ';secure' : '') +
                    ';SameSite=' + sameSite;

                // check the cookie was actually set
                if ((!msToExpire || msToExpire >= 0) && getCookie(cookieName) !== String(value)) {
                    var msg = 'There was an error setting cookie `' + cookieName + '`. Please check domain and path.';
                    logConsoleError(msg);
                }
            }

            /*
             * Removes hash tag from the URL
             *
             * URLs are purified before being recorded in the cookie,
             * or before being sent as GET parameters
             */
            function purify(url) {
                var targetPattern, i;

                // we need to remove this parameter here, they wouldn't be removed in Matomo tracker otherwise eg
                // for outlinks or referrers
                url = removeUrlParameter(url, configVisitorIdUrlParameter);

                // remove ignore referrer parameter if present
                url = removeUrlParameter(url, 'ignore_referrer');
                url = removeUrlParameter(url, 'ignore_referer');

                for (i = 0; i < configExcludedQueryParams.length; i++) {
                    url = removeUrlParameter(url, configExcludedQueryParams[i]);
                }

                if (configDiscardHashTag) {
                    targetPattern = new RegExp('#.*');

                    return url.replace(targetPattern, '');
                }

                return url;
            }

            /*
             * Resolve relative reference
             *
             * Note: not as described in rfc3986 section 5.2
             */
            function resolveRelativeReference(baseUrl, url) {
                var protocol = getProtocolScheme(url),
                    i;

                if (protocol) {
                    return url;
                }

                if (url.slice(0, 1) === '/') {
                    return getProtocolScheme(baseUrl) + '://' + getHostName(baseUrl) + url;
                }

                baseUrl = purify(baseUrl);

                i = baseUrl.indexOf('?');
                if (i >= 0) {
                    baseUrl = baseUrl.slice(0, i);
                }

                i = baseUrl.lastIndexOf('/');
                if (i !== baseUrl.length - 1) {
                    baseUrl = baseUrl.slice(0, i + 1);
                }

                return baseUrl + url;
            }

            function isSameHost (hostName, alias) {
                var offset;

                hostName = String(hostName).toLowerCase();
                alias = String(alias).toLowerCase();

                if (hostName === alias) {
                    return true;
                }

                if (alias.slice(0, 1) === '.') {
                    if (hostName === alias.slice(1)) {
                        return true;
                    }

                    offset = hostName.length - alias.length;

                    if ((offset > 0) && (hostName.slice(offset) === alias)) {
                        return true;
                    }
                }

                return false;
            }

            /*
             * Extract pathname from URL. element.pathname is actually supported by pretty much all browsers including
             * IE6 apart from some rare very old ones
             */
            function getPathName(url) {
                var parser = document.createElement('a');
                if (url.indexOf('//') !== 0 && url.indexOf('http') !== 0) {
                    if (url.indexOf('*') === 0) {
                        url = url.substr(1);
                    }
                    if (url.indexOf('.') === 0) {
                        url = url.substr(1);
                    }
                    url = 'http://' + url;
                }

                parser.href = content.toAbsoluteUrl(url);

                if (parser.pathname) {
                    return parser.pathname;
                }

                return '';
            }

            function isSitePath (path, pathAlias)
            {
                if(!stringStartsWith(pathAlias, '/')) {
                    pathAlias = '/' + pathAlias;
                }

                if(!stringStartsWith(path, '/')) {
                    path = '/' + path;
                }

                var matchesAnyPath = (pathAlias === '/' || pathAlias === '/*');

                if (matchesAnyPath) {
                    return true;
                }

                if (path === pathAlias) {
                    return true;
                }

                pathAlias = String(pathAlias).toLowerCase();
                path = String(path).toLowerCase();

                // wildcard path support
                if(stringEndsWith(pathAlias, '*')) {
                    // remove the final '*' before comparing
                    pathAlias = pathAlias.slice(0, -1);

                    // Note: this is almost duplicated from just few lines above
                    matchesAnyPath = (!pathAlias || pathAlias === '/');

                    if (matchesAnyPath) {
                        return true;
                    }

                    if (path === pathAlias) {
                        return true;
                    }

                    // wildcard match
                    return path.indexOf(pathAlias) === 0;
                }

                // we need to append slashes so /foobarbaz won't match a site /foobar
                if (!stringEndsWith(path, '/')) {
                    path += '/';
                }

                if (!stringEndsWith(pathAlias, '/')) {
                    pathAlias += '/';
                }

                return path.indexOf(pathAlias) === 0;
            }

            /**
             * Whether the specified domain name and path belong to any of the alias domains (eg. set via setDomains).
             *
             * Note: this function is used to determine whether a click on a URL will be considered an "Outlink".
             *
             * @param host
             * @param path
             * @returns {boolean}
             */
            function isSiteHostPath(host, path)
            {
                var i,
                    alias,
                    configAlias,
                    aliasHost,
                    aliasPath;

                for (i = 0; i < configHostsAlias.length; i++) {
                    aliasHost = domainFixup(configHostsAlias[i]);
                    aliasPath = getPathName(configHostsAlias[i]);

                    if (isSameHost(host, aliasHost) && isSitePath(path, aliasPath)) {
                        return true;
                    }
                }

                return false;
            }

            /*
             * Is the host local? (i.e., not an outlink)
             */
            function isSiteHostName(hostName) {

                var i,
                    alias,
                    offset;

                for (i = 0; i < configHostsAlias.length; i++) {
                    alias = domainFixup(configHostsAlias[i].toLowerCase());

                    if (hostName === alias) {
                        return true;
                    }

                    if (alias.slice(0, 1) === '.') {
                        if (hostName === alias.slice(1)) {
                            return true;
                        }

                        offset = hostName.length - alias.length;

                        if ((offset > 0) && (hostName.slice(offset) === alias)) {
                            return true;
                        }
                    }
                }

                return false;
            }

            /**
             * Whether the specified referrer url matches one of the configured excluded referrers.
             *
             * @param string referrerUrl
             * @returns {boolean}
             */
            function isReferrerExcluded(referrerUrl)
            {
                var i,
                    host,
                    path,
                    aliasHost,
                    aliasPath;

                if (!referrerUrl.length || !configExcludedReferrers.length) {
                    return false;
                }

                host = getHostName(referrerUrl);
                path = getPathName(referrerUrl);

                // ignore www subdomain
                if (host.indexOf('www.') === 0) {
                    host = host.substr(4);
                }

                for (i = 0; i < configExcludedReferrers.length; i++) {
                    aliasHost = domainFixup(configExcludedReferrers[i]);
                    aliasPath = getPathName(configExcludedReferrers[i]);

                    // ignore www subdomain
                    if (aliasHost.indexOf('www.') === 0) {
                        aliasHost = aliasHost.substr(4);
                    }

                    if (isSameHost(host, aliasHost) && isSitePath(path, aliasPath)) {
                        return true;
                    }
                }

                return false;
            }

            /*
             * Send image request to Matomo server using GET.
             * The infamous web bug (or beacon) is a transparent, single pixel (1x1) image
             */
            function getImage(request, callback) {
                // make sure to actually load an image so callback gets invoked
                request = request.replace("send_image=0","send_image=1");

                var image = new Image(1, 1);
                image.onload = function () {
                    iterator = 0; // To avoid JSLint warning of empty block
                    if (typeof callback === 'function') {
                        callback({request: request, trackerUrl: configTrackerUrl, success: true});
                    }
                };
                image.onerror = function () {
                    if (typeof callback === 'function') {
                        callback({request: request, trackerUrl: configTrackerUrl, success: false});
                    }
                };
                image.src = configTrackerUrl + (configTrackerUrl.indexOf('?') < 0 ? '?' : '&') + request;
            }

            function shouldForcePost(request)
            {
                if (configRequestMethod === 'POST') {
                    return true;
                }
                // we force long single request urls and bulk requests over post
                return request && (request.length > 2000 || request.indexOf('{"requests"') === 0);
            }

            function supportsSendBeacon()
            {
                return 'object' === typeof navigatorAlias
                    && 'function' === typeof navigatorAlias.sendBeacon
                    && 'function' === typeof Blob;
            }

            function sendPostRequestViaSendBeacon(request, callback, fallbackToGet)
            {
                var isSupported = supportsSendBeacon();

                if (!isSupported) {
                    return false;
                }

                var headers = {type: 'application/x-www-form-urlencoded; charset=UTF-8'};
                var success = false;

                var url = configTrackerUrl;

                try {
                    var blob = new Blob([request], headers);

                    if (fallbackToGet && !shouldForcePost(request)) {
                        blob = new Blob([], headers);
                        url = url + (url.indexOf('?') < 0 ? '?' : '&') + request;
                    }

                    success = navigatorAlias.sendBeacon(url, blob);
                    // returns true if the user agent is able to successfully queue the data for transfer,
                    // Otherwise it returns false and we need to try the regular way

                } catch (e) {
                    return false;
                }

                if (success && typeof callback === 'function') {
                    callback({request: request, trackerUrl: configTrackerUrl, success: true, isSendBeacon: true});
                }

                return success;
            }

            /*
             * POST request to Matomo server using XMLHttpRequest.
             */
            function sendXmlHttpRequest(request, callback, fallbackToGet) {
                if (!isDefined(fallbackToGet) || null === fallbackToGet) {
                    fallbackToGet = true;
                }

                if (isPageUnloading && sendPostRequestViaSendBeacon(request, callback, fallbackToGet)) {
                    return;
                }

                setTimeout(function () {
                    // we execute it with a little delay in case the unload event occurred just after sending this request
                    // this is to avoid the following behaviour: Eg on form submit a tracking request is sent via POST
                    // in this method. Then a few ms later the browser wants to navigate to the new page and the unload
                    // event occurs and the browser cancels the just triggered POST request. This causes or fallback
                    // method to be triggered and we execute the same request again (either as fallbackGet or sendBeacon).
                    // The problem is that we do not know whether the initial POST request was already fully transferred
                    // to the server or not when the onreadystatechange callback is executed and we might execute the
                    // same request a second time. To avoid this, we delay the actual execution of this POST request just
                    // by 50ms which gives it usually enough time to detect the unload event in most cases.

                    if (isPageUnloading && sendPostRequestViaSendBeacon(request, callback, fallbackToGet)) {
                        return;
                    }
                    var sentViaBeacon;

                    try {
                        // we use the progid Microsoft.XMLHTTP because
                        // IE5.5 included MSXML 2.5; the progid MSXML2.XMLHTTP
                        // is pinned to MSXML2.XMLHTTP.3.0
                        var xhr = windowAlias.XMLHttpRequest
                            ? new windowAlias.XMLHttpRequest()
                            : windowAlias.ActiveXObject
                                ? new ActiveXObject('Microsoft.XMLHTTP')
                                : null;

                        xhr.open('POST', configTrackerUrl, true);

                        // fallback on error
                        xhr.onreadystatechange = function () {
                            if (this.readyState === 4 && !(this.status >= 200 && this.status < 300)) {
                                var sentViaBeacon = isPageUnloading && sendPostRequestViaSendBeacon(request, callback, fallbackToGet);

                                if (!sentViaBeacon && fallbackToGet) {
                                    getImage(request, callback);
                                } else if (typeof callback === 'function') {
                                    callback({request: request, trackerUrl: configTrackerUrl, success: false, xhr: this});
                                }

                            } else {
                                if (this.readyState === 4 && (typeof callback === 'function')) {
                                    callback({request: request, trackerUrl: configTrackerUrl, success: true, xhr: this});
                                }
                            }
                        };

                        xhr.setRequestHeader('Content-Type', configRequestContentType);

                        xhr.withCredentials = true;

                        xhr.send(request);
                    } catch (e) {
                        sentViaBeacon = isPageUnloading && sendPostRequestViaSendBeacon(request, callback, fallbackToGet);
                        if (!sentViaBeacon && fallbackToGet) {
                            getImage(request, callback);
                        } else if (typeof callback === 'function') {
                            callback({request: request, trackerUrl: configTrackerUrl, success: false});
                        }
                    }
                }, 50);

            }

            function setExpireDateTime(delay) {

                var now  = new Date();
                var time = now.getTime() + delay;

                if (!expireDateTime || time > expireDateTime) {
                    expireDateTime = time;
                }
            }

            function heartBeatOnFocus() {
                hadWindowFocusAtLeastOnce = true;
                timeWindowLastFocused = new Date().getTime();
            }

            function hadWindowMinimalFocusToConsiderViewed() {
                // we ping on blur or unload only if user was active for more than configHeartBeatDelay seconds on
                // the page otherwise we can assume user was not really on the page and for example only switching
                // through tabs
                var now = new Date().getTime();
                return !timeWindowLastFocused || (now - timeWindowLastFocused) > configHeartBeatDelay;
            }

            function heartBeatOnBlur() {
                if (hadWindowMinimalFocusToConsiderViewed()) {
                    heartBeatPingIfActivityAlias();
                }
            }

            function heartBeatOnVisible() {
                if (documentAlias.visibilityState === 'hidden' && hadWindowMinimalFocusToConsiderViewed()) {
                    heartBeatPingIfActivityAlias();
                } else if (documentAlias.visibilityState === 'visible') {
                    timeWindowLastFocused = new Date().getTime();
                }
            }

            /*
             * Setup event handlers and timeout for initial heart beat.
             */
            function setUpHeartBeat() {
                if (heartBeatSetUp
                    || !configHeartBeatDelay
                ) {
                    return;
                }

                heartBeatSetUp = true;

                addEventListener(windowAlias, 'focus', heartBeatOnFocus);
                addEventListener(windowAlias, 'blur', heartBeatOnBlur);
                addEventListener(windowAlias, 'visibilitychange', heartBeatOnVisible);

                // when using multiple trackers then we need to add this event for each tracker
                coreHeartBeatCounter++;
                Matomo.addPlugin('HeartBeat' + coreHeartBeatCounter, {
                    unload: function () {
                        // we can't remove the unload plugin event when disabling heart beat timer but we at least
                        // check if it is still enabled... note: when enabling heart beat, then disabling, then
                        // enabling then this could trigger two requests under circumstances maybe. it's edge case though

                        // we only send the heartbeat if onunload the user spent at least 15seconds since last focus
                        // or the configured heatbeat timer
                        if (heartBeatSetUp && hadWindowMinimalFocusToConsiderViewed()) {
                            heartBeatPingIfActivityAlias();
                        }
                    }
                });
            }

            function makeSureThereIsAGapAfterFirstTrackingRequestToPreventMultipleVisitorCreation(callback)
            {
                var now     = new Date();
                var timeNow = now.getTime();

                lastTrackerRequestTime = timeNow;

                if (timeNextTrackingRequestCanBeExecutedImmediately && timeNow < timeNextTrackingRequestCanBeExecutedImmediately) {
                    // we are in the time frame shortly after the first request. we have to delay this request a bit to make sure
                    // a visitor has been created meanwhile.

                    var timeToWait = timeNextTrackingRequestCanBeExecutedImmediately - timeNow;

                    setTimeout(callback, timeToWait);
                    setExpireDateTime(timeToWait + 50); // set timeout is not necessarily executed at timeToWait so delay a bit more
                    timeNextTrackingRequestCanBeExecutedImmediately += 50; // delay next tracking request by further 50ms to next execute them at same time

                    return;
                }

                if (timeNextTrackingRequestCanBeExecutedImmediately === false) {
                    // it is the first request, we want to execute this one directly and delay all the next one(s) within a delay.
                    // All requests after this delay can be executed as usual again
                    var delayInMs = 800;
                    timeNextTrackingRequestCanBeExecutedImmediately = timeNow + delayInMs;
                }

                callback();
            }

            /*
             * Check first-party cookies and update the <code>configHasConsent</code> value.  Ensures that any
             * change to the user opt-in/out status in another browser window will be respected.
             */
            function refreshConsentStatus() {
                if (getCookie(CONSENT_REMOVED_COOKIE_NAME)) {
                    configHasConsent = false;
                } else if (getCookie(CONSENT_COOKIE_NAME)) {
                    configHasConsent = true;
                }
            }

            function injectClientHints(request) {
                if (!clientHints) {
                    return request;
                }

                var i, appendix = '&uadata=' + encodeWrapper(windowAlias.JSON.stringify(clientHints));

                if (request instanceof Array) {
                    for (i = 0; i < request.length; i++) {
                       request[i] += appendix;
                    }
                } else {
                    request += appendix;
                }

                return request;
            }

            function detectClientHints (callback) {
                if (!configBrowserFeatureDetection || !isDefined(navigatorAlias.userAgentData) || !isFunction(navigatorAlias.userAgentData.getHighEntropyValues)) {
                    callback();
                    return;
                }

                // Initialize with low entropy values that are always available
                clientHints = {
                    brands: navigatorAlias.userAgentData.brands,
                    platform: navigatorAlias.userAgentData.platform
                };

                // try to gather high entropy values
                // currently this methods simply returns the requested values through a Promise
                // In later versions it might require a user permission
                navigatorAlias.userAgentData.getHighEntropyValues(
                    ['brands', 'model', 'platform', 'platformVersion', 'uaFullVersion', 'fullVersionList']
                ).then(function(ua) {
                    var i;
                    if (ua.fullVersionList) {
                        // if fullVersionList is available, brands and uaFullVersion isn't needed
                        delete ua.brands;
                        delete ua.uaFullVersion;
                    }

                    clientHints = ua;
                    callback();
                }, function (message) {
                    callback();
                });
            }

            /*
             * Send request
             */
            function sendRequest(request, delay, callback) {
                if (!clientHintsResolved) {
                  clientHintsRequestQueue.push(request);
                  return;
                }

                refreshConsentStatus();
                if (!configHasConsent) {
                    consentRequestsQueue.push(request);
                    return;
                }

                hasSentTrackingRequestYet = true;

                if (!configDoNotTrack && request) {
                    if (configConsentRequired && configHasConsent) { // send a consent=1 when explicit consent is given for the apache logs
                        request += '&consent=1';
                    }

                    request = injectClientHints(request);

                    makeSureThereIsAGapAfterFirstTrackingRequestToPreventMultipleVisitorCreation(function () {
                        if (configAlwaysUseSendBeacon && sendPostRequestViaSendBeacon(request, callback, true)) {
                            setExpireDateTime(100);
                            return;
                        }

                        if (shouldForcePost(request)) {
                            sendXmlHttpRequest(request, callback);
                        } else {
                            getImage(request, callback);
                        }

                        setExpireDateTime(delay);
                    });
                }
                if (!heartBeatSetUp) {
                    setUpHeartBeat(); // setup window events too, but only once
                }
            }

            function canSendBulkRequest(requests)
            {
                if (configDoNotTrack) {
                    return false;
                }

                return (requests && requests.length);
            }

            function arrayChunk(theArray, chunkSize)
            {
                if (!chunkSize || chunkSize >= theArray.length) {
                    return [theArray];
                }

                var index = 0;
                var arrLength = theArray.length;
                var chunks = [];

                for (index; index < arrLength; index += chunkSize) {
                    chunks.push(theArray.slice(index, index + chunkSize));
                }

                return chunks;
            }

            /*
             * Send requests using bulk
             */
            function sendBulkRequest(requests, delay)
            {
                if (!canSendBulkRequest(requests)) {
                    return;
                }

                if (!clientHintsResolved) {
                    clientHintsRequestQueue.push(requests);
                    return;
                }

                if (!configHasConsent) {
                    consentRequestsQueue.push(requests);
                    return;
                }

                hasSentTrackingRequestYet = true;

                makeSureThereIsAGapAfterFirstTrackingRequestToPreventMultipleVisitorCreation(function () {
                    var chunks = arrayChunk(requests, 50);

                    var i = 0, bulk;
                    for (i; i < chunks.length; i++) {
                        bulk = '{"requests":["?' + injectClientHints(chunks[i]).join('","?') + '"],"send_image":0}';
                        if (configAlwaysUseSendBeacon && sendPostRequestViaSendBeacon(bulk, null, false)) {
                            // makes sure to load the next page faster by not waiting as long
                            // we apply this once we know send beacon works
                            setExpireDateTime(100);
                        } else {
                            sendXmlHttpRequest(bulk, null, false);
                        }
                    }

                    setExpireDateTime(delay);
                });
            }

            /*
             * Get cookie name with prefix and domain hash
             */
            function getCookieName(baseName) {
                // NOTE: If the cookie name is changed, we must also update the MatomoTracker.php which
                // will attempt to discover first party cookies. eg. See the PHP Client method getVisitorId()
                return configCookieNamePrefix + baseName + '.' + configTrackerSiteId + '.' + domainHash;
            }

            function deleteCookie(cookieName, path, domain) {
                setCookie(cookieName, '', -129600000, path, domain);
            }

            /*
             * Does browser have cookies enabled (for this site)?
             */
            function hasCookies() {
                if (configCookiesDisabled) {
                    return '0';
                }

                if(!isDefined(windowAlias.showModalDialog) && isDefined(navigatorAlias.cookieEnabled)) {
                    return navigatorAlias.cookieEnabled ? '1' : '0';
                }

                // for IE we want to actually set the cookie to avoid trigger a warning eg in IE see #11507
                var testCookieName = configCookieNamePrefix + 'testcookie';
                setCookie(testCookieName, '1', undefined, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);

                var hasCookie = getCookie(testCookieName) === '1' ? '1' : '0';
                deleteCookie(testCookieName);
                return hasCookie;
            }

            /*
             * Update domain hash
             */
            function updateDomainHash() {
                domainHash = hash((configCookieDomain || domainAlias) + (configCookiePath || '/')).slice(0, 4); // 4 hexits = 16 bits
            }

            /*
             * Browser features (plugins, resolution, cookies)
             */
            function detectBrowserFeatures() {
                detectClientHints(function() {
                    var i, requestType;
                    clientHintsResolved = true;
                    for (i = 0; i < clientHintsRequestQueue.length; i++) {
                        requestType = typeof clientHintsRequestQueue[i];
                        if (requestType === 'string') {
                            sendRequest(clientHintsRequestQueue[i], configTrackerPause);
                        } else if (requestType === 'object') {
                            sendBulkRequest(clientHintsRequestQueue[i], configTrackerPause);
                        }
                    }
                    clientHintsRequestQueue = [];
                });

                // Browser Feature is disabled return empty object
                if (!configBrowserFeatureDetection) {
                    return {};
                }
                if (isDefined(browserFeatures.res)) {
                    return browserFeatures;
                }
                var i,
                    mimeType,
                    pluginMap = {
                        // document types
                        pdf: 'application/pdf',

                        // media players
                        qt: 'video/quicktime',
                        realp: 'audio/x-pn-realaudio-plugin',
                        wma: 'application/x-mplayer2',

                        // interactive multimedia
                        fla: 'application/x-shockwave-flash',

                        // RIA
                        java: 'application/x-java-vm',
                        ag: 'application/x-silverlight'
                    };

                // detect browser features except IE < 11 (IE 11 user agent is no longer MSIE)
                if (!((new RegExp('MSIE')).test(navigatorAlias.userAgent))) {
                    // general plugin detection
                    if (navigatorAlias.mimeTypes && navigatorAlias.mimeTypes.length) {
                        for (i in pluginMap) {
                            if (Object.prototype.hasOwnProperty.call(pluginMap, i)) {
                                mimeType = navigatorAlias.mimeTypes[pluginMap[i]];
                                browserFeatures[i] = (mimeType && mimeType.enabledPlugin) ? '1' : '0';
                            }
                        }
                    }

                    // Safari and Opera
                    // IE6/IE7 navigator.javaEnabled can't be aliased, so test directly
                    // on Edge navigator.javaEnabled() always returns `true`, so ignore it
                    if (!((new RegExp('Edge[ /](\\d+[\\.\\d]+)')).test(navigatorAlias.userAgent)) &&
                        typeof navigator.javaEnabled !== 'unknown' &&
                        isDefined(navigatorAlias.javaEnabled) &&
                        navigatorAlias.javaEnabled()) {
                        browserFeatures.java = '1';
                    }

                    if (!isDefined(windowAlias.showModalDialog) && isDefined(navigatorAlias.cookieEnabled)) {
                        browserFeatures.cookie = navigatorAlias.cookieEnabled ? '1' : '0';
                    } else {
                        // Eg IE11 ... prevent error when cookieEnabled is requested within modal dialog. see #11507
                        browserFeatures.cookie = hasCookies();
                    }
                }

                var width = parseInt(screenAlias.width, 10);
                var height = parseInt(screenAlias.height, 10);
                browserFeatures.res = parseInt(width, 10) + 'x' + parseInt(height, 10);
                return browserFeatures;
            }

            /*
             * Inits the custom variables object
             */
            function getCustomVariablesFromCookie() {
                var cookieName = getCookieName('cvar'),
                    cookie = getCookie(cookieName);

                if (cookie && cookie.length) {
                    cookie = windowAlias.JSON.parse(cookie);

                    if (isObject(cookie)) {
                        return cookie;
                    }
                }

                return {};
            }

            /*
             * Lazy loads the custom variables from the cookie, only once during this page view
             */
            function loadCustomVariables() {
                if (customVariables === false) {
                    customVariables = getCustomVariablesFromCookie();
                }
            }

            /*
             * Generate a pseudo-unique ID to fingerprint this user
             * 16 hexits = 64 bits
             * note: this isn't a RFC4122-compliant UUID
             */
            function generateRandomUuid() {
                var browserFeatures = detectBrowserFeatures();
                return hash(
                    (navigatorAlias.userAgent || '') +
                    (navigatorAlias.platform || '') +
                    windowAlias.JSON.stringify(browserFeatures) +
                    (new Date()).getTime() +
                    Math.random()
                ).slice(0, 16);
            }

            function generateBrowserSpecificId() {
                var browserFeatures = detectBrowserFeatures();

                return hash(
                    (navigatorAlias.userAgent || '') +
                    (navigatorAlias.platform || '') +
                    windowAlias.JSON.stringify(browserFeatures)).slice(0, 6);
            }

            function getCurrentTimestampInSeconds()
            {
                return Math.floor((new Date()).getTime() / 1000);
            }

            function makeCrossDomainDeviceId()
            {
                var timestamp = getCurrentTimestampInSeconds();
                var browserId = generateBrowserSpecificId();
                var deviceId = String(timestamp) + browserId;

                return deviceId;
            }

            function isSameCrossDomainDevice(deviceIdFromUrl)
            {
                deviceIdFromUrl = String(deviceIdFromUrl);

                var thisBrowserId = generateBrowserSpecificId();
                var lengthBrowserId = thisBrowserId.length;

                var browserIdInUrl = deviceIdFromUrl.substr(-1 * lengthBrowserId, lengthBrowserId);
                var timestampInUrl = parseInt(deviceIdFromUrl.substr(0, deviceIdFromUrl.length - lengthBrowserId), 10);

                if (timestampInUrl && browserIdInUrl && browserIdInUrl === thisBrowserId) {
                    // we only reuse visitorId when used on same device / browser

                    var currentTimestampInSeconds = getCurrentTimestampInSeconds();

                    if (configVisitorIdUrlParameterTimeoutInSeconds <= 0) {
                        return true;
                    }
                    if (currentTimestampInSeconds >= timestampInUrl
                        && currentTimestampInSeconds <= (timestampInUrl + configVisitorIdUrlParameterTimeoutInSeconds)) {
                        // we only use visitorId if it was generated max 180 seconds ago
                        return true;
                    }
                }

                return false;
            }

            function getVisitorIdFromUrl(url) {
                if (!crossDomainTrackingEnabled) {
                    return '';
                }

                // problem different timezone or when the time on the computer is not set correctly it may re-use
                // the same visitorId again. therefore we also have a factor like hashed user agent to reduce possible
                // activation of a visitorId on other device
                var visitorIdParam = getUrlParameter(url, configVisitorIdUrlParameter);

                if (!visitorIdParam) {
                    return '';
                }

                visitorIdParam = String(visitorIdParam);

                var pattern = new RegExp("^[a-zA-Z0-9]+$");

                if (visitorIdParam.length === 32 && pattern.test(visitorIdParam)) {
                    var visitorDevice = visitorIdParam.substr(16, 32);

                    if (isSameCrossDomainDevice(visitorDevice)) {
                        var visitorId = visitorIdParam.substr(0, 16);
                        return visitorId;
                    }
                }

                return '';
            }

            /*
             * Load visitor ID cookie
             */
            function loadVisitorIdCookie() {

                if (!visitorUUID) {
                    // we are using locationHrefAlias and not currentUrl on purpose to for sure get the passed URL parameters
                    // from original URL
                    visitorUUID = getVisitorIdFromUrl(locationHrefAlias);
                }

                var now = new Date(),
                    nowTs = Math.round(now.getTime() / 1000),
                    visitorIdCookieName = getCookieName('id'),
                    id = getCookie(visitorIdCookieName),
                    cookieValue,
                    uuid;

                // Visitor ID cookie found
                if (id) {
                    cookieValue = id.split('.');

                    // returning visitor flag
                    cookieValue.unshift('0');

                    if(visitorUUID.length) {
                        cookieValue[1] = visitorUUID;
                    }
                    return cookieValue;
                }

                if(visitorUUID.length) {
                    uuid = visitorUUID;
                } else if ('0' === hasCookies()){
                    uuid = '';
                } else {
                    uuid = generateRandomUuid();
                }

                // No visitor ID cookie, let's create a new one
                cookieValue = [
                    // new visitor
                    '1',

                    // uuid
                    uuid,

                    // creation timestamp - seconds since Unix epoch
                    nowTs
                ];

                return cookieValue;
            }


            /**
             * Loads the Visitor ID cookie and returns a named array of values
             */
            function getValuesFromVisitorIdCookie() {
                var cookieVisitorIdValue = loadVisitorIdCookie(),
                    newVisitor = cookieVisitorIdValue[0],
                    uuid = cookieVisitorIdValue[1],
                    createTs = cookieVisitorIdValue[2];

                return {
                    newVisitor: newVisitor,
                    uuid: uuid,
                    createTs: createTs
                };
            }

            function getRemainingVisitorCookieTimeout() {
                var now = new Date(),
                    nowTs = now.getTime(),
                    cookieCreatedTs = getValuesFromVisitorIdCookie().createTs;

                var createTs = parseInt(cookieCreatedTs, 10);
                var originalTimeout = (createTs * 1000) + configVisitorCookieTimeout - nowTs;
                return originalTimeout;
            }

            /*
             * Sets the Visitor ID cookie
             */
            function setVisitorIdCookie(visitorIdCookieValues) {

                if(!configTrackerSiteId) {
                    // when called before Site ID was set
                    return;
                }

                var now = new Date(),
                    nowTs = Math.round(now.getTime() / 1000);

                if(!isDefined(visitorIdCookieValues)) {
                    visitorIdCookieValues = getValuesFromVisitorIdCookie();
                }

                var cookieValue = visitorIdCookieValues.uuid + '.' +
                    visitorIdCookieValues.createTs + '.';

                setCookie(getCookieName('id'), cookieValue, getRemainingVisitorCookieTimeout(), configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
            }

            /*
             * Loads the referrer attribution information
             *
             * @returns array
             *  0: campaign name
             *  1: campaign keyword
             *  2: timestamp
             *  3: raw URL
             */
            function loadReferrerAttributionCookie() {
                // NOTE: if the format of the cookie changes,
                // we must also update JS tests, PHP tracker, System tests,
                // and notify other tracking clients (eg. Java) of the changes
                var cookie = getCookie(getCookieName('ref'));

                if (cookie.length) {
                    try {
                        cookie = windowAlias.JSON.parse(cookie);
                        if (isObject(cookie)) {
                            return cookie;
                        }
                    } catch (ignore) {
                        // Pre 1.3, this cookie was not JSON encoded
                    }
                }

                return [
                    '',
                    '',
                    0,
                    ''
                ];
            }

            function isPossibleToSetCookieOnDomain(domainToTest)
            {
                var testCookieName = configCookieNamePrefix + 'testcookie_domain';
                var valueToSet = 'testvalue';
                setCookie(testCookieName, valueToSet, 10000, null, domainToTest, configCookieIsSecure, configCookieSameSite);

                if (getCookie(testCookieName) === valueToSet) {
                    deleteCookie(testCookieName, null, domainToTest);

                    return true;
                }

                return false;
            }

            function deleteCookies() {
                var savedConfigCookiesDisabled = configCookiesDisabled;

                // Temporarily allow cookies just to delete the existing ones
                configCookiesDisabled = false;

                var index, cookieName;

                for (index = 0; index < configCookiesToDelete.length; index++) {
                    cookieName = getCookieName(configCookiesToDelete[index]);
                    if (cookieName !== CONSENT_REMOVED_COOKIE_NAME && cookieName !== CONSENT_COOKIE_NAME && 0 !== getCookie(cookieName)) {
                        deleteCookie(cookieName, configCookiePath, configCookieDomain);
                    }
                }

                configCookiesDisabled = savedConfigCookiesDisabled;
            }

            function setSiteId(siteId) {
                configTrackerSiteId = siteId;
            }

            function sortObjectByKeys(value) {
                if (!value || !isObject(value)) {
                    return;
                }

                // Object.keys(value) is not supported by all browsers, we get the keys manually
                var keys = [];
                var key;

                for (key in value) {
                    if (Object.prototype.hasOwnProperty.call(value, key)) {
                        keys.push(key);
                    }
                }

                var normalized = {};
                keys.sort();
                var len = keys.length;
                var i;

                for (i = 0; i < len; i++) {
                    normalized[keys[i]] = value[keys[i]];
                }

                return normalized;
            }

            /**
             * Creates the session cookie
             */
            function setSessionCookie() {
                setCookie(getCookieName('ses'), '1', configSessionCookieTimeout, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
            }

            function generateUniqueId() {
                var id = '';
                var chars = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
                var charLen = chars.length;
                var i;

                for (i = 0; i < 6; i++) {
                    id += chars.charAt(Math.floor(Math.random() * charLen));
                }

                return id;
            }

            function appendAvailablePerformanceMetrics(request) {
                if (customPagePerformanceTiming !== '') {
                    request += customPagePerformanceTiming;
                    performanceTracked = true;
                    return request;
                }

                if (!performanceAlias) {
                    return request;
                }

                var performanceData = (typeof performanceAlias.timing === 'object') && performanceAlias.timing ? performanceAlias.timing : undefined;

                if (!performanceData) {
                    performanceData = (typeof performanceAlias.getEntriesByType === 'function') && performanceAlias.getEntriesByType('navigation') ? performanceAlias.getEntriesByType('navigation')[0] : undefined;
                }

                if (!performanceData) {
                    return request;
                }

                // note: there might be negative values because of browser bugs see https://github.com/matomo-org/matomo/pull/16516 in this case we ignore the values
                var timings = '';

                if (performanceData.connectEnd && performanceData.fetchStart) {

                    if (performanceData.connectEnd < performanceData.fetchStart) {
                        return request;
                    }

                    timings += '&pf_net=' + Math.round(performanceData.connectEnd - performanceData.fetchStart);
                }

                if (performanceData.responseStart && performanceData.requestStart) {

                    if (performanceData.responseStart < performanceData.requestStart) {
                        return request;
                    }

                    timings += '&pf_srv=' + Math.round(performanceData.responseStart - performanceData.requestStart);
                }

                if (performanceData.responseStart && performanceData.responseEnd) {

                    if (performanceData.responseEnd < performanceData.responseStart) {
                        return request;
                    }

                    timings += '&pf_tfr=' + Math.round(performanceData.responseEnd - performanceData.responseStart);
                }

                if (isDefined(performanceData.domLoading)) {
                    if (performanceData.domInteractive && performanceData.domLoading) {

                        if (performanceData.domInteractive < performanceData.domLoading) {
                            return request;
                        }

                        timings += '&pf_dm1=' + Math.round(performanceData.domInteractive - performanceData.domLoading);
                    }
                } else {
                    if (performanceData.domInteractive && performanceData.responseEnd) {

                        if (performanceData.domInteractive < performanceData.responseEnd) {
                            return request;
                        }

                        timings += '&pf_dm1=' + Math.round(performanceData.domInteractive - performanceData.responseEnd);
                    }
                }

                if (performanceData.domComplete && performanceData.domInteractive) {

                    if (performanceData.domComplete < performanceData.domInteractive) {
                        return request;
                    }

                    timings += '&pf_dm2=' + Math.round(performanceData.domComplete - performanceData.domInteractive);
                }

                if (performanceData.loadEventEnd && performanceData.loadEventStart) {

                    if (performanceData.loadEventEnd < performanceData.loadEventStart) {
                        return request;
                    }

                    timings += '&pf_onl=' + Math.round(performanceData.loadEventEnd - performanceData.loadEventStart);
                }

                return request + timings;
            }

            /**
             * Returns if the given url contains a parameter to ignore the referrer
             * e.g. ignore_referer or ignore_referrer
             * @param url
             * @returns {boolean}
             */
            function hasIgnoreReferrerParameter(url) {
                return getUrlParameter(url, 'ignore_referrer') === "1" || getUrlParameter(url, 'ignore_referer') === "1";
            }

            function detectReferrerAttribution() {
                var i,
                    now = new Date(),
                    nowTs = Math.round(now.getTime() / 1000),
                    referralTs,
                    referralUrl,
                    referralUrlMaxLength = 1024,
                    currentReferrerHostName,
                    originalReferrerHostName,
                    cookieSessionName = getCookieName('ses'),
                    cookieReferrerName = getCookieName('ref'),
                    cookieSessionValue = getCookie(cookieSessionName),
                    attributionCookie = loadReferrerAttributionCookie(),
                    currentUrl = configCustomUrl || locationHrefAlias,
                    campaignNameDetected,
                    campaignKeywordDetected,
                    attributionValues = {};

                campaignNameDetected = attributionCookie[0];
                campaignKeywordDetected = attributionCookie[1];
                referralTs = attributionCookie[2];
                referralUrl = attributionCookie[3];

                if (!hasIgnoreReferrerParameter(currentUrl) && !cookieSessionValue) {
                    // cookie 'ses' was not found: we consider this the start of a 'session'

                    // Detect the campaign information from the current URL
                    // Only if campaign wasn't previously set
                    // Or if it was set but we must attribute to the most recent one
                    // Note: we are working on the currentUrl before purify() since we can parse the campaign parameters in the hash tag
                    if (!configConversionAttributionFirstReferrer
                        || !campaignNameDetected.length) {
                        for (i in configCampaignNameParameters) {
                            if (Object.prototype.hasOwnProperty.call(configCampaignNameParameters, i)) {
                                campaignNameDetected = getUrlParameter(currentUrl, configCampaignNameParameters[i]);

                                if (campaignNameDetected.length) {
                                    break;
                                }
                            }
                        }

                        for (i in configCampaignKeywordParameters) {
                            if (Object.prototype.hasOwnProperty.call(configCampaignKeywordParameters, i)) {
                                campaignKeywordDetected = getUrlParameter(currentUrl, configCampaignKeywordParameters[i]);

                                if (campaignKeywordDetected.length) {
                                    break;
                                }
                            }
                        }
                    }

                    // Store the referrer URL and time in the cookie;
                    // referral URL depends on the first or last referrer attribution
                    currentReferrerHostName = getHostName(configReferrerUrl);
                    originalReferrerHostName = referralUrl.length ? getHostName(referralUrl) : '';

                    if (currentReferrerHostName.length // there is a referrer
                        && !isSiteHostName(currentReferrerHostName) // domain is not the current domain
                        && !isReferrerExcluded(configReferrerUrl) // referrer is excluded
                        && (
                            !configConversionAttributionFirstReferrer // attribute to last known referrer
                            || !originalReferrerHostName.length // previously empty
                            || isSiteHostName(originalReferrerHostName) // previously set but in current domain
                            || isReferrerExcluded(referralUrl) // previously set but excluded
                        )
                    ) {
                        referralUrl = configReferrerUrl;
                    }

                    // Set the referral cookie if we have either a Referrer URL, or detected a Campaign (or both)
                    if (referralUrl.length
                        || campaignNameDetected.length) {
                        referralTs = nowTs;
                        attributionCookie = [
                            campaignNameDetected,
                            campaignKeywordDetected,
                            referralTs,
                            purify(referralUrl.slice(0, referralUrlMaxLength))
                        ];

                        setCookie(cookieReferrerName, windowAlias.JSON.stringify(attributionCookie), configReferralCookieTimeout, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
                    }
                }

                if (campaignNameDetected.length) {
                    attributionValues._rcn = encodeWrapper(campaignNameDetected);
                }

                if (campaignKeywordDetected.length) {
                    attributionValues._rck = encodeWrapper(campaignKeywordDetected);
                }

                attributionValues._refts = referralTs;

                if (String(referralUrl).length) {
                    attributionValues._ref = encodeWrapper(purify(referralUrl.slice(0, referralUrlMaxLength)));
                }


                return attributionValues;
            }

            /**
             * Returns the URL to call matomo.php,
             * with the standard parameters (plugins, resolution, url, referrer, etc.).
             * Sends the pageview and browser settings with every request in case of race conditions.
             */
            function getRequest(request, customData, pluginMethod) {
                var i,
                    now = new Date(),
                    customVariablesCopy = customVariables,
                    cookieCustomVariablesName = getCookieName('cvar'),
                    currentUrl = configCustomUrl || locationHrefAlias,
                    hasIgnoreReferrerParam = hasIgnoreReferrerParameter(currentUrl);

                if (configCookiesDisabled) {
                    deleteCookies();
                }

                if (configDoNotTrack) {
                    return '';
                }

                var cookieVisitorIdValues = getValuesFromVisitorIdCookie();

                // send charset if document charset is not utf-8. sometimes encoding
                // of urls will be the same as this and not utf-8, which will cause problems
                // do not send charset if it is utf8 since it's assumed by default in Matomo
                var charSet = documentAlias.characterSet || documentAlias.charset;

                if (!charSet || charSet.toLowerCase() === 'utf-8') {
                    charSet = null;
                }

                // build out the rest of the request
                request += '&idsite=' + configTrackerSiteId +
                    '&rec=1' +
                    '&r=' + String(Math.random()).slice(2, 8) + // keep the string to a minimum
                    '&h=' + now.getHours() + '&m=' + now.getMinutes() + '&s=' + now.getSeconds() +
                    '&url=' + encodeWrapper(purify(currentUrl)) +
                    (configReferrerUrl.length && !isReferrerExcluded(configReferrerUrl) && !hasIgnoreReferrerParam ? '&urlref=' + encodeWrapper(purify(configReferrerUrl)) : '') +
                    (isNumberOrHasLength(configUserId) ? '&uid=' + encodeWrapper(configUserId) : '') +
                    '&_id=' + cookieVisitorIdValues.uuid +
                    '&_idn=' + cookieVisitorIdValues.newVisitor + // currently unused
                    (charSet ? '&cs=' + encodeWrapper(charSet) : '') +
                    '&send_image=0';

                var referrerAttribution = detectReferrerAttribution();
                // referrer attribution
                for (i in referrerAttribution) {
                    if (Object.prototype.hasOwnProperty.call(referrerAttribution, i)) {
                        request += '&' + i + '=' + referrerAttribution[i];
                    }
                }

                var browserFeatures = detectBrowserFeatures();
                // browser features
                for (i in browserFeatures) {
                    if (Object.prototype.hasOwnProperty.call(browserFeatures, i)) {
                        request += '&' + i + '=' + browserFeatures[i];
                    }
                }

                var customDimensionIdsAlreadyHandled = [];
                if (customData) {
                    for (i in customData) {
                        if (Object.prototype.hasOwnProperty.call(customData, i) && /^dimension\d+$/.test(i)) {
                            var index = i.replace('dimension', '');
                            customDimensionIdsAlreadyHandled.push(parseInt(index, 10));
                            customDimensionIdsAlreadyHandled.push(String(index));
                            request += '&' + i + '=' + encodeWrapper(customData[i]);
                            delete customData[i];
                        }
                    }
                }

                if (customData && isObjectEmpty(customData)) {
                    customData = null;
                    // we deleted all keys from custom data
                }

                // product page view
                for (i in ecommerceProductView) {
                    if (Object.prototype.hasOwnProperty.call(ecommerceProductView, i)) {
                        request += '&' + i + '=' + encodeWrapper(ecommerceProductView[i]);
                    }
                }

                // custom dimensions
                for (i in customDimensions) {
                    if (Object.prototype.hasOwnProperty.call(customDimensions, i)) {
                        var isNotSetYet = (-1 === indexOfArray(customDimensionIdsAlreadyHandled, i));
                        if (isNotSetYet) {
                            request += '&dimension' + i + '=' + encodeWrapper(customDimensions[i]);
                        }
                    }
                }

                // custom data
                if (customData) {
                    request += '&data=' + encodeWrapper(windowAlias.JSON.stringify(customData));
                } else if (configCustomData) {
                    request += '&data=' + encodeWrapper(windowAlias.JSON.stringify(configCustomData));
                }

                // Custom Variables, scope "page"
                function appendCustomVariablesToRequest(customVariables, parameterName) {
                    var customVariablesStringified = windowAlias.JSON.stringify(customVariables);
                    if (customVariablesStringified.length > 2) {
                        return '&' + parameterName + '=' + encodeWrapper(customVariablesStringified);
                    }
                    return '';
                }

                var sortedCustomVarPage = sortObjectByKeys(customVariablesPage);
                var sortedCustomVarEvent = sortObjectByKeys(customVariablesEvent);

                request += appendCustomVariablesToRequest(sortedCustomVarPage, 'cvar');
                request += appendCustomVariablesToRequest(sortedCustomVarEvent, 'e_cvar');

                // Custom Variables, scope "visit"
                if (customVariables) {
                    request += appendCustomVariablesToRequest(customVariables, '_cvar');

                    // Don't save deleted custom variables in the cookie
                    for (i in customVariablesCopy) {
                        if (Object.prototype.hasOwnProperty.call(customVariablesCopy, i)) {
                            if (customVariables[i][0] === '' || customVariables[i][1] === '') {
                                delete customVariables[i];
                            }
                        }
                    }

                    if (configStoreCustomVariablesInCookie) {
                        setCookie(cookieCustomVariablesName, windowAlias.JSON.stringify(customVariables), configSessionCookieTimeout, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
                    }
                }

                // performance tracking
                if (configPerformanceTrackingEnabled && performanceAvailable && !performanceTracked) {
                    request = appendAvailablePerformanceMetrics(request);
                    performanceTracked = true;
                }

                if (configIdPageView) {
                    request += '&pv_id=' + configIdPageView;
                }

                // update cookies
                setVisitorIdCookie(cookieVisitorIdValues);
                setSessionCookie();

                // tracker plugin hook
                request += executePluginMethod(pluginMethod, {tracker: trackerInstance, request: request});

                if (configAppendToTrackingUrl.length) {
                    request += '&' + configAppendToTrackingUrl;
                }

                if (isFunction(configCustomRequestContentProcessing)) {
                    request = configCustomRequestContentProcessing(request);
                }

                return request;
            }

            /*
             * If there was user activity since the last check, and it's been configHeartBeatDelay seconds
             * since the last tracker, send a ping request (the heartbeat timeout will be reset by sendRequest).
             */
            heartBeatPingIfActivityAlias = function heartBeatPingIfActivity() {
                var now = new Date();
                now = now.getTime();

                if (!lastTrackerRequestTime) {
                    return false; // no tracking request was ever sent so lets not send heartbeat now
                }

                if (lastTrackerRequestTime + configHeartBeatDelay <= now) {
                    trackerInstance.ping();

                    return true;
                }

                return false;
            };

            function logEcommerce(orderId, grandTotal, subTotal, tax, shipping, discount) {
                var request = 'idgoal=0',
                    now = new Date(),
                    items = [],
                    sku,
                    isEcommerceOrder = String(orderId).length;

                if (isEcommerceOrder) {
                    request += '&ec_id=' + encodeWrapper(orderId);
                }

                request += '&revenue=' + grandTotal;

                if (String(subTotal).length) {
                    request += '&ec_st=' + subTotal;
                }

                if (String(tax).length) {
                    request += '&ec_tx=' + tax;
                }

                if (String(shipping).length) {
                    request += '&ec_sh=' + shipping;
                }

                if (String(discount).length) {
                    request += '&ec_dt=' + discount;
                }

                if (ecommerceItems) {
                    // Removing the SKU index in the array before JSON encoding
                    for (sku in ecommerceItems) {
                        if (Object.prototype.hasOwnProperty.call(ecommerceItems, sku)) {
                            // Ensure name and category default to healthy value
                            if (!isDefined(ecommerceItems[sku][1])) {
                                ecommerceItems[sku][1] = "";
                            }

                            if (!isDefined(ecommerceItems[sku][2])) {
                                ecommerceItems[sku][2] = "";
                            }

                            // Set price to zero
                            if (!isDefined(ecommerceItems[sku][3])
                                || String(ecommerceItems[sku][3]).length === 0) {
                                ecommerceItems[sku][3] = 0;
                            }

                            // Set quantity to 1
                            if (!isDefined(ecommerceItems[sku][4])
                                || String(ecommerceItems[sku][4]).length === 0) {
                                ecommerceItems[sku][4] = 1;
                            }

                            items.push(ecommerceItems[sku]);
                        }
                    }
                    request += '&ec_items=' + encodeWrapper(windowAlias.JSON.stringify(items));
                }
                request = getRequest(request, configCustomData, 'ecommerce');
                sendRequest(request, configTrackerPause);

                if (isEcommerceOrder) {
                    ecommerceItems = {};
                }
            }

            function logEcommerceOrder(orderId, grandTotal, subTotal, tax, shipping, discount) {
                if (String(orderId).length
                    && isDefined(grandTotal)) {
                    logEcommerce(orderId, grandTotal, subTotal, tax, shipping, discount);
                }
            }

            function logEcommerceCartUpdate(grandTotal) {
                if (isDefined(grandTotal)) {
                    logEcommerce("", grandTotal, "", "", "", "");
                }
            }

            /*
             * Log the page view / visit
             */
            function logPageView(customTitle, customData, callback) {
                if (!configIdPageViewSetManually) {
                    configIdPageView = generateUniqueId();
                }

                var request = getRequest('action_name=' + encodeWrapper(titleFixup(customTitle || configTitle)), customData, 'log');

                // append already available performance metrics if they were not already tracked (or appended)
                if (configPerformanceTrackingEnabled && !performanceTracked) {
                    request = appendAvailablePerformanceMetrics(request);
                }

                sendRequest(request, configTrackerPause, callback);
            }

            /*
             * Construct regular expression of classes
             */
            function getClassesRegExp(configClasses, defaultClass) {
                var i,
                    classesRegExp = '(^| )(piwik[_-]' + defaultClass + '|matomo[_-]' + defaultClass;

                if (configClasses) {
                    for (i = 0; i < configClasses.length; i++) {
                        classesRegExp += '|' + configClasses[i];
                    }
                }

                classesRegExp += ')( |$)';

                return new RegExp(classesRegExp);
            }

            function startsUrlWithTrackerUrl(url) {
                return (configTrackerUrl && url && 0 === String(url).indexOf(configTrackerUrl));
            }

            /*
             * Link or Download?
             */
            function getLinkType(className, href, isInLink, hasDownloadAttribute) {
                if (startsUrlWithTrackerUrl(href)) {
                    return 0;
                }

                // does class indicate whether it is an (explicit/forced) outlink or a download?
                var downloadPattern = getClassesRegExp(configDownloadClasses, 'download'),
                    linkPattern = getClassesRegExp(configLinkClasses, 'link'),

                    // does file extension indicate that it is a download?
                    downloadExtensionsPattern = new RegExp('\\.(' + configDownloadExtensions.join('|') + ')([?&#]|$)', 'i');

                if (linkPattern.test(className)) {
                    return 'link';
                }

                if (hasDownloadAttribute || downloadPattern.test(className) || downloadExtensionsPattern.test(href)) {
                    return 'download';
                }

                if (isInLink) {
                    return 0;
                }

                return 'link';
            }

            function getSourceElement(sourceElement)
            {
                var parentElement;

                parentElement = sourceElement.parentNode;
                while (parentElement !== null &&
                /* buggy IE5.5 */
                isDefined(parentElement)) {

                    if (query.isLinkElement(sourceElement)) {
                        break;
                    }
                    sourceElement = parentElement;
                    parentElement = sourceElement.parentNode;
                }

                return sourceElement;
            }

            function getLinkIfShouldBeProcessed(sourceElement)
            {
                sourceElement = getSourceElement(sourceElement);

                if (!query.hasNodeAttribute(sourceElement, 'href')) {
                    return;
                }

                if (!isDefined(sourceElement.href)) {
                    return;
                }

                var href = query.getAttributeValueFromNode(sourceElement, 'href');

                var originalSourcePath = sourceElement.pathname || getPathName(sourceElement.href);

                // browsers, such as Safari, don't downcase hostname and href
                var originalSourceHostName = sourceElement.hostname || getHostName(sourceElement.href);
                var sourceHostName = originalSourceHostName.toLowerCase();
                var sourceHref = sourceElement.href.replace(originalSourceHostName, sourceHostName);

                // browsers, such as Safari, don't downcase hostname and href
                var scriptProtocol = new RegExp('^(javascript|vbscript|jscript|mocha|livescript|ecmascript|mailto|tel):', 'i');

                if (!scriptProtocol.test(sourceHref)) {
                    // track outlinks and all downloads
                    var linkType = getLinkType(sourceElement.className, sourceHref, isSiteHostPath(sourceHostName, originalSourcePath), query.hasNodeAttribute(sourceElement, 'download'));

                    if (linkType) {
                        return {
                            type: linkType,
                            href: sourceHref
                        };
                    }
                }
            }

            function buildContentInteractionRequest(interaction, name, piece, target)
            {
                var params = content.buildInteractionRequestParams(interaction, name, piece, target);

                if (!params) {
                    return;
                }

                return getRequest(params, null, 'contentInteraction');
            }

            function isNodeAuthorizedToTriggerInteraction(contentNode, interactedNode)
            {
                if (!contentNode || !interactedNode) {
                    return false;
                }

                var targetNode = content.findTargetNode(contentNode);

                if (content.shouldIgnoreInteraction(targetNode)) {
                    // interaction should be ignored
                    return false;
                }

                targetNode = content.findTargetNodeNoDefault(contentNode);
                if (targetNode && !containsNodeElement(targetNode, interactedNode)) {
                    /**
                     * There is a target node defined but the clicked element is not within the target node. example:
                     * <div data-track-content><a href="Y" data-content-target>Y</a><img src=""/><a href="Z">Z</a></div>
                     *
                     * The user clicked in this case on link Z and not on target Y
                     */
                    return false;
                }

                return true;
            }

            function getContentInteractionToRequestIfPossible (anyNode, interaction, fallbackTarget)
            {
                if (!anyNode) {
                    return;
                }

                var contentNode = content.findParentContentNode(anyNode);

                if (!contentNode) {
                    // we are not within a content block
                    return;
                }

                if (!isNodeAuthorizedToTriggerInteraction(contentNode, anyNode)) {
                    return;
                }

                var contentBlock = content.buildContentBlock(contentNode);

                if (!contentBlock) {
                    return;
                }

                if (!contentBlock.target && fallbackTarget) {
                    contentBlock.target = fallbackTarget;
                }

                return content.buildInteractionRequestParams(interaction, contentBlock.name, contentBlock.piece, contentBlock.target);
            }

            function wasContentImpressionAlreadyTracked(contentBlock)
            {
                if (!trackedContentImpressions || !trackedContentImpressions.length) {
                    return false;
                }

                var index, trackedContent;

                for (index = 0; index < trackedContentImpressions.length; index++) {
                    trackedContent = trackedContentImpressions[index];

                    if (trackedContent &&
                        trackedContent.name === contentBlock.name &&
                        trackedContent.piece === contentBlock.piece &&
                        trackedContent.target === contentBlock.target) {
                        return true;
                    }
                }

                return false;
            }

            function trackContentImpressionClickInteraction (targetNode)
            {
                return function (event) {

                    if (!targetNode) {
                        return;
                    }

                    var contentBlock = content.findParentContentNode(targetNode);

                    var interactedElement;
                    if (event) {
                        interactedElement = event.target || event.srcElement;
                    }
                    if (!interactedElement) {
                        interactedElement = targetNode;
                    }

                    if (!isNodeAuthorizedToTriggerInteraction(contentBlock, interactedElement)) {
                        return;
                    }

                    if (!contentBlock) {
                        return false;
                    }

                    var theTargetNode = content.findTargetNode(contentBlock);

                    if (!theTargetNode || content.shouldIgnoreInteraction(theTargetNode)) {
                        return false;
                    }

                    var link = getLinkIfShouldBeProcessed(theTargetNode);

                    if (linkTrackingEnabled && link && link.type) {
                        return link.type; // will be handled via outlink or download.
                    }

                    return trackerInstance.trackContentInteractionNode(interactedElement, 'click');
                };
            }

            function setupInteractionsTracking(contentNodes)
            {
                if (!contentNodes || !contentNodes.length) {
                    return;
                }

                var index, targetNode;
                for (index = 0; index < contentNodes.length; index++) {
                    targetNode = content.findTargetNode(contentNodes[index]);

                    if (targetNode && !targetNode.contentInteractionTrackingSetupDone) {
                        targetNode.contentInteractionTrackingSetupDone = true;

                        addEventListener(targetNode, 'click', trackContentImpressionClickInteraction(targetNode));
                    }
                }
            }

            /*
             * Log all content pieces
             */
            function buildContentImpressionsRequests(contents, contentNodes)
            {
                if (!contents || !contents.length) {
                    return [];
                }

                var index, request;

                for (index = 0; index < contents.length; index++) {

                    if (wasContentImpressionAlreadyTracked(contents[index])) {
                        contents.splice(index, 1);
                        index--;
                    } else {
                        trackedContentImpressions.push(contents[index]);
                    }
                }

                if (!contents || !contents.length) {
                    return [];
                }

                setupInteractionsTracking(contentNodes);

                var requests = [];

                for (index = 0; index < contents.length; index++) {

                    request = getRequest(
                        content.buildImpressionRequestParams(contents[index].name, contents[index].piece, contents[index].target),
                        undefined,
                        'contentImpressions'
                    );

                    if (request) {
                        requests.push(request);
                    }
                }

                return requests;
            }

            /*
             * Log all content pieces
             */
            function getContentImpressionsRequestsFromNodes(contentNodes)
            {
                var contents = content.collectContent(contentNodes);

                return buildContentImpressionsRequests(contents, contentNodes);
            }

            /*
             * Log currently visible content pieces
             */
            function getCurrentlyVisibleContentImpressionsRequestsIfNotTrackedYet(contentNodes)
            {
                if (!contentNodes || !contentNodes.length) {
                    return [];
                }

                var index;

                for (index = 0; index < contentNodes.length; index++) {
                    if (!content.isNodeVisible(contentNodes[index])) {
                        contentNodes.splice(index, 1);
                        index--;
                    }
                }

                if (!contentNodes || !contentNodes.length) {
                    return [];
                }

                return getContentImpressionsRequestsFromNodes(contentNodes);
            }

            function buildContentImpressionRequest(contentName, contentPiece, contentTarget)
            {
                var params = content.buildImpressionRequestParams(contentName, contentPiece, contentTarget);

                return getRequest(params, null, 'contentImpression');
            }

            function buildContentInteractionRequestNode(node, contentInteraction)
            {
                if (!node) {
                    return;
                }

                var contentNode  = content.findParentContentNode(node);
                var contentBlock = content.buildContentBlock(contentNode);

                if (!contentBlock) {
                    return;
                }

                if (!contentInteraction) {
                    contentInteraction = 'Unknown';
                }

                return buildContentInteractionRequest(contentInteraction, contentBlock.name, contentBlock.piece, contentBlock.target);
            }

            function buildEventRequest(category, action, name, value)
            {
                return 'e_c=' + encodeWrapper(category)
                    + '&e_a=' + encodeWrapper(action)
                    + (isDefined(name) ? '&e_n=' + encodeWrapper(name) : '')
                    + (isDefined(value) ? '&e_v=' + encodeWrapper(value) : '')
                    + '&ca=1';
            }

            /*
             * Log the event
             */
            function logEvent(category, action, name, value, customData, callback)
            {
                // Category and Action are required parameters
                if (!isNumberOrHasLength(category) || !isNumberOrHasLength(action)) {
                    logConsoleError('Error while logging event: Parameters `category` and `action` must not be empty or filled with whitespaces');
                    return false;
                }
                var request = getRequest(
                    buildEventRequest(category, action, name, value),
                    customData,
                    'event'
                );

                sendRequest(request, configTrackerPause, callback);
            }

            /*
             * Log the site search request
             */
            function logSiteSearch(keyword, category, resultsCount, customData) {
                var request = getRequest('search=' + encodeWrapper(keyword)
                    + (category ? '&search_cat=' + encodeWrapper(category) : '')
                    + (isDefined(resultsCount) ? '&search_count=' + resultsCount : ''), customData, 'sitesearch');

                sendRequest(request, configTrackerPause);
            }

            /*
             * Log the goal with the server
             */
            function logGoal(idGoal, customRevenue, customData, callback) {
                var request = getRequest('idgoal=' + idGoal + (customRevenue ? '&revenue=' + customRevenue : ''), customData, 'goal');

                sendRequest(request, configTrackerPause, callback);
            }

            /*
             * Log the link or click with the server
             */
            function logLink(url, linkType, customData, callback, sourceElement) {

                var linkParams = linkType + '=' + encodeWrapper(purify(url));

                var interaction = getContentInteractionToRequestIfPossible(sourceElement, 'click', url);

                if (interaction) {
                    linkParams += '&' + interaction;
                }

                var request = getRequest(linkParams, customData, 'link');

                sendRequest(request, configTrackerPause, callback);
            }

            /*
             * Browser prefix
             */
            function prefixPropertyName(prefix, propertyName) {
                if (prefix !== '') {
                    return prefix + propertyName.charAt(0).toUpperCase() + propertyName.slice(1);
                }

                return propertyName;
            }

            /*
             * Check for pre-rendered web pages, and log the page view/link/goal
             * according to the configuration and/or visibility
             *
             * @see http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html
             */
            function trackCallback(callback) {
                var isPreRendered,
                    i,
                    // Chrome 13, IE10, FF10
                    prefixes = ['', 'webkit', 'ms', 'moz'],
                    prefix;

                if (!configCountPreRendered) {
                    for (i = 0; i < prefixes.length; i++) {
                        prefix = prefixes[i];

                        // does this browser support the page visibility API?
                        if (Object.prototype.hasOwnProperty.call(documentAlias, prefixPropertyName(prefix, 'hidden'))) {
                            // if pre-rendered, then defer callback until page visibility changes
                            if (documentAlias[prefixPropertyName(prefix, 'visibilityState')] === 'prerender') {
                                isPreRendered = true;
                            }
                            break;
                        }
                    }
                }

                if (isPreRendered) {
                    // note: the event name doesn't follow the same naming convention as vendor properties
                    addEventListener(documentAlias, prefix + 'visibilitychange', function ready() {
                        documentAlias.removeEventListener(prefix + 'visibilitychange', ready, false);
                        callback();
                    });

                    return;
                }

                // configCountPreRendered === true || isPreRendered === false
                callback();
            }

            function getCrossDomainVisitorId()
            {
                var visitorId = trackerInstance.getVisitorId();
                var deviceId = makeCrossDomainDeviceId();
                return visitorId + deviceId;
            }

            function replaceHrefForCrossDomainLink(element)
            {
                if (!element) {
                    return;
                }

                if (!query.hasNodeAttribute(element, 'href')) {
                    return;
                }

                var link = query.getAttributeValueFromNode(element, 'href');

                if (!link || startsUrlWithTrackerUrl(link)) {
                    return;
                }

                if (!trackerInstance.getVisitorId()) {
                    return; // cookies are disabled.
                }

                // we need to remove the parameter and add it again if needed to make sure we have latest timestamp
                // and visitorId (eg userId might be set etc)
                link = removeUrlParameter(link, configVisitorIdUrlParameter);

                var crossDomainVisitorId = getCrossDomainVisitorId();

                link = addUrlParameter(link, configVisitorIdUrlParameter, crossDomainVisitorId);

                query.setAnyAttribute(element, 'href', link);
            }

            function isLinkToDifferentDomainButSameMatomoWebsite(element)
            {
                var targetLink = query.getAttributeValueFromNode(element, 'href');

                if (!targetLink) {
                    return false;
                }

                targetLink = String(targetLink);

                var isOutlink = targetLink.indexOf('//') === 0
                    || targetLink.indexOf('http://') === 0
                    || targetLink.indexOf('https://') === 0;

                if (!isOutlink) {
                    return false;
                }

                var originalSourcePath = element.pathname || getPathName(element.href);
                var originalSourceHostName = (element.hostname || getHostName(element.href)).toLowerCase();

                if (isSiteHostPath(originalSourceHostName, originalSourcePath)) {
                    // we could also check against config cookie domain but this would require that other website
                    // sets actually same cookie domain and we cannot rely on it.
                    if (!isSameHost(domainAlias, domainFixup(originalSourceHostName))) {
                        return true;
                    }

                    return false;
                }

                return false;
            }

            /*
             * Process clicks
             */
            function processClick(sourceElement) {
                var link = getLinkIfShouldBeProcessed(sourceElement);

                // not a link to same domain or the same website (as set in setDomains())
                if (link && link.type) {
                    link.href = safeDecodeWrapper(link.href);
                    logLink(link.href, link.type, undefined, null, sourceElement);
                    return;
                }


                // a link to same domain or the same website (as set in setDomains())
                if (crossDomainTrackingEnabled) {
                    // in case the clicked element is within the <a> (for example there is a <div> within the <a>) this will get the actual <a> link element
                    sourceElement = getSourceElement(sourceElement);

                    if(isLinkToDifferentDomainButSameMatomoWebsite(sourceElement)) {
                        replaceHrefForCrossDomainLink(sourceElement);
                    }

                }
            }

            function isIE8orOlder()
            {
                return documentAlias.all && !documentAlias.addEventListener;
            }

            function getKeyCodeFromEvent(event)
            {
                // event.which is deprecated https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which
                var which = event.which;

                /**
                 1 : Left mouse button
                 2 : Wheel button or middle button
                 3 : Right mouse button
                 */

                var typeOfEventButton = (typeof event.button);

                if (!which && typeOfEventButton !== 'undefined' ) {
                    /**
                     -1: No button pressed
                     0 : Main button pressed, usually the left button
                     1 : Auxiliary button pressed, usually the wheel button or themiddle button (if present)
                     2 : Secondary button pressed, usually the right button
                     3 : Fourth button, typically the Browser Back button
                     4 : Fifth button, typically the Browser Forward button

                     IE8 and earlier has different values:
                     1 : Left mouse button
                     2 : Right mouse button
                     4 : Wheel button or middle button

                     For a left-hand configured mouse, the return values are reversed. We do not take care of that.
                     */

                    if (isIE8orOlder()) {
                        if (event.button & 1) {
                            which = 1;
                        } else if (event.button & 2) {
                            which = 3;
                        } else if (event.button & 4) {
                            which = 2;
                        }
                    } else {
                        if (event.button === 0 || event.button === '0') {
                            which = 1;
                        } else if (event.button & 1) {
                            which = 2;
                        } else if (event.button & 2) {
                            which = 3;
                        }
                    }
                }

                return which;
            }

            function getNameOfClickedButton(event)
            {
                switch (getKeyCodeFromEvent(event)) {
                    case 1:
                        return 'left';
                    case 2:
                        return 'middle';
                    case 3:
                        return 'right';
                }
            }

            function getTargetElementFromEvent(event)
            {
                return event.target || event.srcElement;
            }

            function isClickNode(nodeName)
            {
                return nodeName === 'A' || nodeName === 'AREA';
            }

            /*
             * Handle click event
             */
            function clickHandler(enable) {

                function getLinkTarget(event)
                {
                    var target = getTargetElementFromEvent(event);
                    var nodeName = target.nodeName;
                    var ignorePattern = getClassesRegExp(configIgnoreClasses, 'ignore');

                    while (!isClickNode(nodeName) && target && target.parentNode) {
                        target = target.parentNode;
                        nodeName = target.nodeName;
                    }

                    if (target && isClickNode(nodeName) && !ignorePattern.test(target.className)) {
                        return target;
                    }
                }

                return function (event) {

                    event = event || windowAlias.event;

                    var target = getLinkTarget(event);
                    if (!target) {
                        return;
                    }

                    var button = getNameOfClickedButton(event);

                    if (event.type === 'click') {

                        var ignoreClick = false;
                        if (enable && button === 'middle') {
                            // if enabled, we track middle clicks via mouseup
                            // some browsers (eg chrome) trigger click and mousedown/up events when middle is clicked,
                            // whereas some do not. This way we make "sure" to track them only once, either in click
                            // (default) or in mouseup (if enable == true)
                            ignoreClick = true;
                        }

                        if (target && !ignoreClick) {
                            processClick(target);
                        }
                    } else if (event.type === 'mousedown') {
                        if (button === 'middle' && target) {
                            lastButton = button;
                            lastTarget = target;
                        } else {
                            lastButton = lastTarget = null;
                        }
                    } else if (event.type === 'mouseup') {
                        if (button === lastButton && target === lastTarget) {
                            processClick(target);
                        }
                        lastButton = lastTarget = null;
                    } else if (event.type === 'contextmenu') {
                        processClick(target);
                    }
                };
            }

            /*
             * Add click listener to a DOM element
             */
            function addClickListener(element, enable, useCapture) {
                var enableType = typeof enable;
                if (enableType === 'undefined') {
                    enable = true;
                }

                addEventListener(element, 'click', clickHandler(enable), useCapture);

                if (enable) {
                    addEventListener(element, 'mouseup', clickHandler(enable), useCapture);
                    addEventListener(element, 'mousedown', clickHandler(enable), useCapture);
                    addEventListener(element, 'contextmenu', clickHandler(enable), useCapture);
                }
            }


            function enableTrackOnlyVisibleContent (checkOnScroll, timeIntervalInMs, tracker) {

                if (isTrackOnlyVisibleContentEnabled) {
                    // already enabled, do not register intervals again
                    return true;
                }

                isTrackOnlyVisibleContentEnabled = true;

                var didScroll = false;
                var events, index;

                function setDidScroll() { didScroll = true; }

                trackCallbackOnLoad(function () {

                    function checkContent(intervalInMs) {
                        setTimeout(function () {
                            if (!isTrackOnlyVisibleContentEnabled) {
                                return; // the tests stopped tracking only visible content
                            }
                            didScroll = false;
                            tracker.trackVisibleContentImpressions();
                            checkContent(intervalInMs);
                        }, intervalInMs);
                    }

                    function checkContentIfDidScroll(intervalInMs) {

                        setTimeout(function () {
                            if (!isTrackOnlyVisibleContentEnabled) {
                                return; // the tests stopped tracking only visible content
                            }

                            if (didScroll) {
                                didScroll = false;
                                tracker.trackVisibleContentImpressions();
                            }

                            checkContentIfDidScroll(intervalInMs);
                        }, intervalInMs);
                    }

                    if (checkOnScroll) {

                        // scroll event is executed after each pixel, so we make sure not to
                        // execute event too often. otherwise FPS goes down a lot!
                        events = ['scroll', 'resize'];
                        for (index = 0; index < events.length; index++) {
                            if (documentAlias.addEventListener) {
                                documentAlias.addEventListener(events[index], setDidScroll, false);
                            } else {
                                windowAlias.attachEvent('on' + events[index], setDidScroll);
                            }
                        }

                        checkContentIfDidScroll(100);
                    }

                    if (timeIntervalInMs && timeIntervalInMs > 0) {
                        timeIntervalInMs = parseInt(timeIntervalInMs, 10);
                        checkContent(timeIntervalInMs);
                    }

                });
            }

            /*<DEBUG>*/
            /*
             * Register a test hook. Using eval() permits access to otherwise
             * privileged members.
             */
            function registerHook(hookName, userHook) {
                var hookObj = null;

                if (isString(hookName) && !isDefined(registeredHooks[hookName]) && userHook) {
                    if (isObject(userHook)) {
                        hookObj = userHook;
                    } else if (isString(userHook)) {
                        try {
                            eval('hookObj =' + userHook);
                        } catch (ignore) { }
                    }

                    registeredHooks[hookName] = hookObj;
                }

                return hookObj;
            }

            /*</DEBUG>*/

            var requestQueue = {
                enabled: true,
                requests: [],
                timeout: null,
                interval: 2500,
                sendRequests: function () {
                    var requestsToTrack = this.requests;
                    this.requests = [];
                    if (requestsToTrack.length === 1) {
                        sendRequest(requestsToTrack[0], configTrackerPause);
                    } else {
                        sendBulkRequest(requestsToTrack, configTrackerPause);
                    }
                },
                canQueue: function () {
                    return !isPageUnloading && this.enabled;
                },
                pushMultiple: function (requests) {
                    if (!this.canQueue()) {
                        sendBulkRequest(requests, configTrackerPause);
                        return;
                    }

                    var i;
                    for (i = 0; i < requests.length; i++) {
                        this.push(requests[i]);
                    }
                },
                push: function (requestUrl) {
                    if (!requestUrl) {
                        return;
                    }
                    if (!this.canQueue()) {
                        // we don't queue as we need to ensure the request will be sent when the page is unloading...
                        sendRequest(requestUrl, configTrackerPause);
                        return;
                    }

                    requestQueue.requests.push(requestUrl);

                    if (this.timeout) {
                        clearTimeout(this.timeout);
                        this.timeout = null;
                    }
                    // we always extend by another 2.5 seconds after receiving a tracking request
                    this.timeout = setTimeout(function () {
                        requestQueue.timeout = null;
                        requestQueue.sendRequests();
                    }, requestQueue.interval);

                    var trackerQueueId = 'RequestQueue' + uniqueTrackerId;
                    if (!Object.prototype.hasOwnProperty.call(plugins, trackerQueueId)) {
                        // we setup one unload handler per tracker...
                        // Matomo.addPlugin might not be defined at this point, we add the plugin directly also to make
                        // JSLint happy.
                        plugins[trackerQueueId] = {
                            unload: function () {
                                if (requestQueue.timeout) {
                                    clearTimeout(requestQueue.timeout);
                                }
                                requestQueue.sendRequests();
                            }
                        };
                    }
                }
            };
            /************************************************************
             * Constructor
             ************************************************************/

            /*
             * initialize tracker
             */
            updateDomainHash();

            /*<DEBUG>*/
            /*
             * initialize test plugin
             */
            executePluginMethod('run', null, registerHook);
            /*</DEBUG>*/

            /************************************************************
             * Public data and methods
             ************************************************************/


            /*<DEBUG>*/
            /*
             * Test hook accessors
             */
            this.hook = registeredHooks;
            this.getHook = function (hookName) {
                return registeredHooks[hookName];
            };
            this.getQuery = function () {
                return query;
            };
            this.getContent = function () {
                return content;
            };
            this.isUsingAlwaysUseSendBeacon = function () {
                return configAlwaysUseSendBeacon;
            };

            this.buildContentImpressionRequest = buildContentImpressionRequest;
            this.buildContentInteractionRequest = buildContentInteractionRequest;
            this.buildContentInteractionRequestNode = buildContentInteractionRequestNode;
            this.getContentImpressionsRequestsFromNodes = getContentImpressionsRequestsFromNodes;
            this.getCurrentlyVisibleContentImpressionsRequestsIfNotTrackedYet = getCurrentlyVisibleContentImpressionsRequestsIfNotTrackedYet;
            this.trackCallbackOnLoad = trackCallbackOnLoad;
            this.trackCallbackOnReady = trackCallbackOnReady;
            this.buildContentImpressionsRequests = buildContentImpressionsRequests;
            this.wasContentImpressionAlreadyTracked = wasContentImpressionAlreadyTracked;
            this.appendContentInteractionToRequestIfPossible = getContentInteractionToRequestIfPossible;
            this.setupInteractionsTracking = setupInteractionsTracking;
            this.trackContentImpressionClickInteraction = trackContentImpressionClickInteraction;
            this.internalIsNodeVisible = isVisible;
            this.isNodeAuthorizedToTriggerInteraction = isNodeAuthorizedToTriggerInteraction;
            this.getDomains = function () {
                return configHostsAlias;
            };
            this.getExcludedReferrers = function () {
                return configExcludedReferrers;
            };
            this.getConfigIdPageView = function () {
                return configIdPageView;
            };
            this.getConfigDownloadExtensions = function () {
                return configDownloadExtensions;
            };
            this.enableTrackOnlyVisibleContent = function (checkOnScroll, timeIntervalInMs) {
                return enableTrackOnlyVisibleContent(checkOnScroll, timeIntervalInMs, this);
            };
            this.clearTrackedContentImpressions = function () {
                trackedContentImpressions = [];
            };
            this.getTrackedContentImpressions = function () {
                return trackedContentImpressions;
            };
            this.clearEnableTrackOnlyVisibleContent = function () {
                isTrackOnlyVisibleContentEnabled = false;
            };
            this.disableLinkTracking = function () {
                linkTrackingInstalled = false;
                linkTrackingEnabled   = false;
            };

            this.getConfigVisitorCookieTimeout = function () {
                return configVisitorCookieTimeout;
            };
            this.getConfigCookieSameSite = function () {
                return configCookieSameSite;
            };
            this.getCustomPagePerformanceTiming = function () {
                return customPagePerformanceTiming;
            };
            this.removeAllAsyncTrackersButFirst = function () {
                var firstTracker = asyncTrackers[0];
                asyncTrackers = [firstTracker];
            };
            this.getConsentRequestsQueue = function () {
                return consentRequestsQueue;
            };
            this.getRequestQueue = function () {
                return requestQueue;
            };
            this.getJavascriptErrors = function () {
                return javaScriptErrors;
            };
            this.unsetPageIsUnloading = function () {
                isPageUnloading = false;
            };
            this.getRemainingVisitorCookieTimeout = getRemainingVisitorCookieTimeout;
            /*</DEBUG>*/
            this.hasConsent = function () {
                return configHasConsent;
            };

            /**
             * Get the visitor information (from first party cookie)
             *
             * @return array
             */
            this.getVisitorInfo = function () {
                if (!getCookie(getCookieName('id'))) {
                    setVisitorIdCookie();
                }

                // Note: in a new method, we could return also return getValuesFromVisitorIdCookie()
                //       which returns named parameters rather than returning integer indexed array
                return loadVisitorIdCookie();
            };

            /**
             * Get visitor ID (from first party cookie)
             *
             * @return string Visitor ID in hexits (or empty string, if not yet known)
             */
            this.getVisitorId = function () {
                return this.getVisitorInfo()[1];
            };

            /**
             * Get the Attribution information, which is an array that contains
             * the Referrer used to reach the site as well as the campaign name and keyword
             * It is useful only when used in conjunction with Tracker API function setAttributionInfo()
             * To access specific data point, you should use the other functions getAttributionReferrer* and getAttributionCampaign*
             *
             * @return array Attribution array, Example use:
             *   1) Call windowAlias.JSON.stringify(matomoTracker.getAttributionInfo())
             *   2) Pass this json encoded string to the Tracking API (php or java client): setAttributionInfo()
             */
            this.getAttributionInfo = function () {
                return loadReferrerAttributionCookie();
            };

            /**
             * Get the Campaign name that was parsed from the landing page URL when the visitor
             * landed on the site originally
             *
             * @return string
             */
            this.getAttributionCampaignName = function () {
                return loadReferrerAttributionCookie()[0];
            };

            /**
             * Get the Campaign keyword that was parsed from the landing page URL when the visitor
             * landed on the site originally
             *
             * @return string
             */
            this.getAttributionCampaignKeyword = function () {
                return loadReferrerAttributionCookie()[1];
            };

            /**
             * Get the time at which the referrer (used for Goal Attribution) was detected
             *
             * @return int Timestamp or 0 if no referrer currently set
             */
            this.getAttributionReferrerTimestamp = function () {
                return loadReferrerAttributionCookie()[2];
            };

            /**
             * Get the full referrer URL that will be used for Goal Attribution
             *
             * @return string Raw URL, or empty string '' if no referrer currently set
             */
            this.getAttributionReferrerUrl = function () {
                return loadReferrerAttributionCookie()[3];
            };

            /**
             * Specify the Matomo tracking URL
             *
             * @param string trackerUrl
             */
            this.setTrackerUrl = function (trackerUrl) {
                configTrackerUrl = trackerUrl;
            };

            /**
             * Returns the Matomo tracking URL
             * @returns string
             */
            this.getTrackerUrl = function () {
                return configTrackerUrl;
            };

            /**
             * Returns the Matomo server URL.
             *
             * @returns string
             */
            this.getMatomoUrl = function () {
                return getMatomoUrlForOverlay(this.getTrackerUrl(), configApiUrl);
            };

            /**
             * Returns the Matomo server URL.
             * @deprecated since Matomo 4.0.0 use `getMatomoUrl()` instead.
             * @returns string
             */
            this.getPiwikUrl = function () {
                return this.getMatomoUrl();
            };

            /**
             * Adds a new tracker. All sent requests will be also sent to the given siteId and matomoUrl.
             *
             * @param string matomoUrl  The tracker URL of the current tracker instance
             * @param int|string siteId
             * @return Tracker
             */
            this.addTracker = function (matomoUrl, siteId) {
                if (!isDefined(matomoUrl) || null === matomoUrl) {
                    matomoUrl = this.getTrackerUrl();
                }

                var tracker = new Tracker(matomoUrl, siteId);

                asyncTrackers.push(tracker);

                Matomo.trigger('TrackerAdded', [this]);

                return tracker;
            };

            /**
             * Returns the site ID
             *
             * @returns int
             */
            this.getSiteId = function() {
                return configTrackerSiteId;
            };

            /**
             * Specify the site ID
             *
             * @param int|string siteId
             */
            this.setSiteId = function (siteId) {
                setSiteId(siteId);
            };

            /**
             * Clears the User ID
             */
            this.resetUserId = function() {
                configUserId = '';
            };

            /**
             * Sets a User ID to this user (such as an email address or a username)
             *
             * @param string User ID
             */
            this.setUserId = function (userId) {
                if (isNumberOrHasLength(userId)) {
                    configUserId = userId;
                }
            };

            /**
             * Sets a Visitor ID to this visitor. Should be a 16 digit hex string.
             * The visitorId won't be persisted in a cookie or something similar and needs to be set every time.
             *
             * @param string User ID
             */
            this.setVisitorId = function (visitorId) {
                var validation = /[0-9A-Fa-f]{16}/g;

                if (isString(visitorId) && validation.test(visitorId)) {
                    visitorUUID = visitorId;
                } else {
                    logConsoleError('Invalid visitorId set' + visitorId);
                }
            };

            /**
             * Gets the User ID if set.
             *
             * @returns string User ID
             */
            this.getUserId = function() {
                return configUserId;
            };

            /**
             * Pass custom data to the server
             *
             * Examples:
             *   tracker.setCustomData(object);
             *   tracker.setCustomData(key, value);
             *
             * @param mixed key_or_obj
             * @param mixed opt_value
             */
            this.setCustomData = function (key_or_obj, opt_value) {
                if (isObject(key_or_obj)) {
                    configCustomData = key_or_obj;
                } else {
                    if (!configCustomData) {
                        configCustomData = {};
                    }
                    configCustomData[key_or_obj] = opt_value;
                }
            };

            /**
             * Get custom data
             *
             * @return mixed
             */
            this.getCustomData = function () {
                return configCustomData;
            };

            /**
             * Configure function with custom request content processing logic.
             * It gets called after request content in form of query parameters string has been prepared and before request content gets sent.
             *
             * Examples:
             *   tracker.setCustomRequestProcessing(function(request){
             *     var pairs = request.split('&');
             *     var result = {};
             *     pairs.forEach(function(pair) {
             *       pair = pair.split('=');
             *       result[pair[0]] = decodeURIComponent(pair[1] || '');
             *     });
             *     return JSON.stringify(result);
             *   });
             *
             * @param function customRequestContentProcessingLogic
             */
            this.setCustomRequestProcessing = function (customRequestContentProcessingLogic) {
                configCustomRequestContentProcessing = customRequestContentProcessingLogic;
            };

            /**
             * Appends the specified query string to the matomo.php?... Tracking API URL
             *
             * @param string queryString eg. 'lat=140&long=100'
             */
            this.appendToTrackingUrl = function (queryString) {
                configAppendToTrackingUrl = queryString;
            };

            /**
             * Returns the query string for the current HTTP Tracking API request.
             * Matomo would prepend the hostname and path to Matomo: http://example.org/matomo/matomo.php?
             * prior to sending the request.
             *
             * @param request eg. "param=value&param2=value2"
             */
            this.getRequest = function (request) {
                return getRequest(request);
            };

            /**
             * Add plugin defined by a name and a callback function.
             * The callback function will be called whenever a tracking request is sent.
             * This can be used to append data to the tracking request, or execute other custom logic.
             *
             * @param string pluginName
             * @param Object pluginObj
             */
            this.addPlugin = function (pluginName, pluginObj) {
                plugins[pluginName] = pluginObj;
            };

            /**
             * Set Custom Dimensions. Set Custom Dimensions will not be cleared after a tracked pageview and will
             * be sent along all following tracking requests. It is possible to remove/clear a value via `deleteCustomDimension`.
             *
             * @param int index A Custom Dimension index
             * @param string value
             */
            this.setCustomDimension = function (customDimensionId, value) {
                customDimensionId = parseInt(customDimensionId, 10);
                if (customDimensionId > 0) {
                    if (!isDefined(value)) {
                        value = '';
                    }
                    if (!isString(value)) {
                        value = String(value);
                    }
                    customDimensions[customDimensionId] = value;
                }
            };

            /**
             * Get a stored value for a specific Custom Dimension index.
             *
             * @param int index A Custom Dimension index
             */
            this.getCustomDimension = function (customDimensionId) {
                customDimensionId = parseInt(customDimensionId, 10);
                if (customDimensionId > 0 && Object.prototype.hasOwnProperty.call(customDimensions, customDimensionId)) {
                    return customDimensions[customDimensionId];
                }
            };

            /**
             * Delete a custom dimension.
             *
             * @param int index Custom dimension Id
             */
            this.deleteCustomDimension = function (customDimensionId) {
                customDimensionId = parseInt(customDimensionId, 10);
                if (customDimensionId > 0) {
                    delete customDimensions[customDimensionId];
                }
            };

            /**
             * Set custom variable within this visit
             *
             * @param int index Custom variable slot ID from 1-5
             * @param string name
             * @param string value
             * @param string scope Scope of Custom Variable:
             *                     - "visit" will store the name/value in the visit and will persist it in the cookie for the duration of the visit,
             *                     - "page" will store the name/value in the next page view tracked.
             *                     - "event" will store the name/value in the next event tracked.
             */
            this.setCustomVariable = function (index, name, value, scope) {
                var toRecord;

                if (!isDefined(scope)) {
                    scope = 'visit';
                }
                if (!isDefined(name)) {
                    return;
                }
                if (!isDefined(value)) {
                    value = "";
                }
                if (index > 0) {
                    name = !isString(name) ? String(name) : name;
                    value = !isString(value) ? String(value) : value;
                    toRecord = [name.slice(0, customVariableMaximumLength), value.slice(0, customVariableMaximumLength)];
                    // numeric scope is there for GA compatibility
                    if (scope === 'visit' || scope === 2) {
                        loadCustomVariables();
                        customVariables[index] = toRecord;
                    } else if (scope === 'page' || scope === 3) {
                        customVariablesPage[index] = toRecord;
                    } else if (scope === 'event') { /* GA does not have 'event' scope but we do */
                        customVariablesEvent[index] = toRecord;
                    }
                }
            };

            /**
             * Get custom variable
             *
             * @param int index Custom variable slot ID from 1-5
             * @param string scope Scope of Custom Variable: "visit" or "page" or "event"
             */
            this.getCustomVariable = function (index, scope) {
                var cvar;

                if (!isDefined(scope)) {
                    scope = "visit";
                }

                if (scope === "page" || scope === 3) {
                    cvar = customVariablesPage[index];
                } else if (scope === "event") {
                    cvar = customVariablesEvent[index];
                } else if (scope === "visit" || scope === 2) {
                    loadCustomVariables();
                    cvar = customVariables[index];
                }

                if (!isDefined(cvar)
                    || (cvar && cvar[0] === '')) {
                    return false;
                }

                return cvar;
            };

            /**
             * Delete custom variable
             *
             * @param int index Custom variable slot ID from 1-5
             * @param string scope
             */
            this.deleteCustomVariable = function (index, scope) {
                // Only delete if it was there already
                if (this.getCustomVariable(index, scope)) {
                    this.setCustomVariable(index, '', '', scope);
                }
            };

            /**
             * Deletes all custom variables for a certain scope.
             *
             * @param string scope
             */
            this.deleteCustomVariables = function (scope) {
                if (scope === "page" || scope === 3) {
                    customVariablesPage = {};
                } else if (scope === "event") {
                    customVariablesEvent = {};
                } else if (scope === "visit" || scope === 2) {
                    customVariables = {};
                }
            };

            /**
             * When called then the Custom Variables of scope "visit" will be stored (persisted) in a first party cookie
             * for the duration of the visit. This is useful if you want to call getCustomVariable later in the visit.
             *
             * By default, Custom Variables of scope "visit" are not stored on the visitor's computer.
             */
            this.storeCustomVariablesInCookie = function () {
                configStoreCustomVariablesInCookie = true;
            };

            /**
             * Set delay for link tracking (in milliseconds)
             *
             * @param int delay
             */
            this.setLinkTrackingTimer = function (delay) {
                configTrackerPause = delay;
            };

            /**
             * Get delay for link tracking (in milliseconds)
             *
             * @param int delay
             */
            this.getLinkTrackingTimer = function () {
                return configTrackerPause;
            };

            /**
             * Set list of file extensions to be recognized as downloads
             *
             * @param string|array extensions
             */
            this.setDownloadExtensions = function (extensions) {
                if(isString(extensions)) {
                    extensions = extensions.split('|');
                }
                configDownloadExtensions = extensions;
            };

            /**
             * Specify additional file extensions to be recognized as downloads
             *
             * @param string|array extensions  for example 'custom' or ['custom1','custom2','custom3']
             */
            this.addDownloadExtensions = function (extensions) {
                var i;
                if(isString(extensions)) {
                    extensions = extensions.split('|');
                }
                for (i=0; i < extensions.length; i++) {
                    configDownloadExtensions.push(extensions[i]);
                }
            };

            /**
             * Removes specified file extensions from the list of recognized downloads
             *
             * @param string|array extensions  for example 'custom' or ['custom1','custom2','custom3']
             */
            this.removeDownloadExtensions = function (extensions) {
                var i, newExtensions = [];
                if(isString(extensions)) {
                    extensions = extensions.split('|');
                }
                for (i=0; i < configDownloadExtensions.length; i++) {
                    if (indexOfArray(extensions, configDownloadExtensions[i]) === -1) {
                        newExtensions.push(configDownloadExtensions[i]);
                    }
                }
                configDownloadExtensions = newExtensions;
            };

            /**
             * Set array of domains to be treated as local. Also supports path, eg '.matomo.org/subsite1'. In this
             * case all links that don't go to '*.matomo.org/subsite1/ *' would be treated as outlinks.
             * For example a link to 'matomo.org/' or 'matomo.org/subsite2' both would be treated as outlinks.
             *
             * Also supports page wildcard, eg 'matomo.org/index*'. In this case all links
             * that don't go to matomo.org/index* would be treated as outlinks.
             *
             * The current domain will be added automatically if no given host alias contains a path and if no host
             * alias is already given for the current host alias. Say you are on "example.org" and set
             * "hostAlias = ['example.com', 'example.org/test']" then the current "example.org" domain will not be
             * added as there is already a more restrictive hostAlias 'example.org/test' given. We also do not add
             * it automatically if there was any other host specifying any path like
             * "['example.com', 'example2.com/test']". In this case we would also not add the current
             * domain "example.org" automatically as the "path" feature is used. As soon as someone uses the path
             * feature, for Matomo JS Tracker to work correctly in all cases, one needs to specify all hosts
             * manually.
             *
             * @param string|array hostsAlias
             */
            this.setDomains = function (hostsAlias) {
                configHostsAlias = isString(hostsAlias) ? [hostsAlias] : hostsAlias;

                var hasDomainAliasAlready = false, i = 0, alias;
                for (i; i < configHostsAlias.length; i++) {
                    alias = String(configHostsAlias[i]);

                    if (isSameHost(domainAlias, domainFixup(alias))) {
                        hasDomainAliasAlready = true;
                        break;
                    }

                    var pathName = getPathName(alias);
                    if (pathName && pathName !== '/' && pathName !== '/*') {
                        hasDomainAliasAlready = true;
                        break;
                    }
                }

                // The current domain will be added automatically if no given host alias contains a path
                // and if no host alias is already given for the current host alias.
                if (!hasDomainAliasAlready) {
                    /**
                     * eg if domainAlias = 'matomo.org' and someone set hostsAlias = ['matomo.org/foo'] then we should
                     * not add matomo.org as it would increase the allowed scope.
                     */
                    configHostsAlias.push(domainAlias);
                }
            };

          /**
           * Set array of domains to be excluded as referrer. Also supports path, eg '.matomo.org/subsite1'. In this
           * case all referrers that don't match '*.matomo.org/subsite1/ *' would still be used as referrer.
           * For example 'matomo.org/' or 'matomo.org/subsite2' would both be used as referrer.
           *
           * Also supports page wildcard, eg 'matomo.org/index*'. In this case all referrers
           * that don't match matomo.org/index* would still be treated as referrer.
           *
           * Domains added with setDomains will automatically be excluded as referrers.
           *
           * @param string|array excludedReferrers
           */
            this.setExcludedReferrers = function(excludedReferrers) {
                configExcludedReferrers = isString(excludedReferrers) ? [excludedReferrers] : excludedReferrers;
            };

            /**
             * Enables cross domain linking. By default, the visitor ID that identifies a unique visitor is stored in
             * the browser's first party cookies. This means the cookie can only be accessed by pages on the same domain.
             * If you own multiple domains and would like to track all the actions and pageviews of a specific visitor
             * into the same visit, you may enable cross domain linking. Whenever a user clicks on a link it will append
             * a URL parameter pk_vid to the clicked URL which consists of these parts: 16 char visitorId, a 10 character
             * current timestamp and the last 6 characters are an id based on the userAgent to identify the users device).
             * This way the current visitorId is forwarded to the page of the different domain.
             *
             * On the different domain, the Matomo tracker will recognize the set visitorId from the URL parameter and
             * reuse this parameter if the page was loaded within 45 seconds. If cross domain linking was not enabled,
             * it would create a new visit on that page because we wouldn't be able to access the previously created
             * cookie. By enabling cross domain linking you can track several different domains into one website and
             * won't lose for example the original referrer.
             *
             * To make cross domain linking work you need to set which domains should be considered as your domains by
             * calling the method "setDomains()" first. We will add the URL parameter to links that go to a
             * different domain but only if the domain was previously set with "setDomains()" to make sure not to append
             * the URL parameters when a link actually goes to a third-party URL.
             */
            this.enableCrossDomainLinking = function () {
                crossDomainTrackingEnabled = true;
            };

            /**
             * Disable cross domain linking if it was previously enabled. See enableCrossDomainLinking();
             */
            this.disableCrossDomainLinking = function () {
                crossDomainTrackingEnabled = false;
            };

            /**
             * Detect whether cross domain linking is enabled or not. See enableCrossDomainLinking();
             * @returns bool
             */
            this.isCrossDomainLinkingEnabled = function () {
                return crossDomainTrackingEnabled;
            };


            /**
             * By default, the two visits across domains will be linked together
             * when the link is click and the page is loaded within 180 seconds.
             * @param timeout in seconds
             */
            this.setCrossDomainLinkingTimeout = function (timeout) {
                configVisitorIdUrlParameterTimeoutInSeconds = timeout;
            };

            /**
             * Returns the query parameter appended to link URLs so cross domain visits
             * can be detected.
             *
             * If your application creates links dynamically, then you'll have to add this
             * query parameter manually to those links (since the JavaScript tracker cannot
             * detect when those links are added).
             *
             * Eg:
             *
             * var url = 'http://myotherdomain.com/?' + matomoTracker.getCrossDomainLinkingUrlParameter();
             * $element.append('<a href="' + url + '"/>');
             */
            this.getCrossDomainLinkingUrlParameter = function () {
                return encodeWrapper(configVisitorIdUrlParameter) + '=' + encodeWrapper(getCrossDomainVisitorId());
            };

            /**
             * Set array of classes to be ignored if present in link
             *
             * @param string|array ignoreClasses
             */
            this.setIgnoreClasses = function (ignoreClasses) {
                configIgnoreClasses = isString(ignoreClasses) ? [ignoreClasses] : ignoreClasses;
            };

            /**
             * Set request method. If you specify GET then it will automatically disable sendBeacon.
             *
             * @param string method GET or POST; default is GET
             */
            this.setRequestMethod = function (method) {
                if (method) {
                    configRequestMethod = String(method).toUpperCase();
                } else {
                    configRequestMethod = defaultRequestMethod;
                }

                if (configRequestMethod === 'GET') {
                    // send beacon always sends a POST request so we have to disable it to make GET work
                    this.disableAlwaysUseSendBeacon();
                }
            };

            /**
             * Set request Content-Type header value, applicable when POST request method is used for submitting tracking events.
             * See XMLHttpRequest Level 2 spec, section 4.7.2 for invalid headers
             * @link http://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html
             *
             * @param string requestContentType; default is 'application/x-www-form-urlencoded; charset=UTF-8'
             */
            this.setRequestContentType = function (requestContentType) {
                configRequestContentType = requestContentType || defaultRequestContentType;
            };

            /**
             * Removed since Matomo 4
             * @param generationTime
             */
            this.setGenerationTimeMs = function(generationTime) {
                logConsoleError('setGenerationTimeMs is no longer supported since Matomo 4. The call will be ignored. The replacement is setPagePerformanceTiming.');
            };

            /**
             * Replace setGenerationTimeMs with this more generic function
             * Use in SPA
             * @param networkTimeInMs
             * @param serverTimeInMs
             * @param transferTimeInMs
             * @param domProcessingTimeInMs
             * @param domCompletionTimeInMs
             * @param onloadTimeInMs
             */
            this.setPagePerformanceTiming = function(
                networkTimeInMs, serverTimeInMs, transferTimeInMs,
                domProcessingTimeInMs, domCompletionTimeInMs, onloadTimeInMs
            ) {
                /*members pf_net, pf_srv, pf_tfr, pf_dm1, pf_dm2, pf_onl */
                var data = {
                    pf_net: networkTimeInMs,
                    pf_srv: serverTimeInMs,
                    pf_tfr: transferTimeInMs,
                    pf_dm1: domProcessingTimeInMs,
                    pf_dm2: domCompletionTimeInMs,
                    pf_onl: onloadTimeInMs
                };

                try {
                    data = filterIn(data, isDefined);
                    data = onlyPositiveIntegers(data);
                    customPagePerformanceTiming = queryStringify(data);
                    if (customPagePerformanceTiming === '') {
                        logConsoleError('setPagePerformanceTiming() called without parameters. This function needs to be called with at least one performance parameter.');
                        return;
                    }

                    performanceTracked = false; // to ensure the values are sent (again)
                    performanceAvailable = true; // so appendAvailablePerformanceMetrics will be called directly
                    // Otherwise performanceAvailable will be set when the pageload finished, but there is no need
                    // to wait for that, when the values are set manually.
                } catch (error) {
                    logConsoleError('setPagePerformanceTiming: ' + error.toString());
                }
            };

            /**
             * Override referrer
             *
             * @param string url
             */
            this.setReferrerUrl = function (url) {
                configReferrerUrl = url;
            };

            /**
             * Override url
             *
             * @param string url
             */
            this.setCustomUrl = function (url) {
                configCustomUrl = resolveRelativeReference(locationHrefAlias, url);
            };

            /**
             * Returns the current url of the page that is currently being visited. If a custom URL was set, the
             * previously defined custom URL will be returned.
             */
            this.getCurrentUrl = function () {
                return configCustomUrl || locationHrefAlias;
            };

            /**
             * Override document.title
             *
             * @param string title
             */
            this.setDocumentTitle = function (title) {
                configTitle = title;
            };

            /**
             * Override PageView id for every use of logPageView(). Do not use this if you call trackPageView()
             * multiple times during tracking (if, for example, you are tracking a single page application).
             *
             * @param string pageView
             */
            this.setPageViewId = function (pageView) {
                configIdPageView = pageView;
                configIdPageViewSetManually = true;
            };

            /**
             * Set the URL of the Matomo API. It is used for Page Overlay.
             * This method should only be called when the API URL differs from the tracker URL.
             *
             * @param string apiUrl
             */
            this.setAPIUrl = function (apiUrl) {
                configApiUrl = apiUrl;
            };

            /**
             * Set array of classes to be treated as downloads
             *
             * @param string|array downloadClasses
             */
            this.setDownloadClasses = function (downloadClasses) {
                configDownloadClasses = isString(downloadClasses) ? [downloadClasses] : downloadClasses;
            };

            /**
             * Set array of classes to be treated as outlinks
             *
             * @param string|array linkClasses
             */
            this.setLinkClasses = function (linkClasses) {
                configLinkClasses = isString(linkClasses) ? [linkClasses] : linkClasses;
            };

            /**
             * Set array of campaign name parameters
             *
             * @see https://matomo.org/faq/how-to/faq_120
             * @param string|array campaignNames
             */
            this.setCampaignNameKey = function (campaignNames) {
                configCampaignNameParameters = isString(campaignNames) ? [campaignNames] : campaignNames;
            };

            /**
             * Set array of campaign keyword parameters
             *
             * @see https://matomo.org/faq/how-to/faq_120
             * @param string|array campaignKeywords
             */
            this.setCampaignKeywordKey = function (campaignKeywords) {
                configCampaignKeywordParameters = isString(campaignKeywords) ? [campaignKeywords] : campaignKeywords;
            };

            /**
             * Strip hash tag (or anchor) from URL
             * Note: this can be done in the Matomo>Settings>Websites on a per-website basis
             *
             * @deprecated
             * @param bool enableFilter
             */
            this.discardHashTag = function (enableFilter) {
                configDiscardHashTag = enableFilter;
            };

            /**
             * Set first-party cookie name prefix
             *
             * @param string cookieNamePrefix
             */
            this.setCookieNamePrefix = function (cookieNamePrefix) {
                configCookieNamePrefix = cookieNamePrefix;
                // Re-init the Custom Variables cookie
                if (customVariables) {
                    customVariables = getCustomVariablesFromCookie();
                }
            };

            /**
             * Set first-party cookie domain
             *
             * @param string domain
             */
            this.setCookieDomain = function (domain) {
                var domainFixed = domainFixup(domain);

                if (!configCookiesDisabled && !isPossibleToSetCookieOnDomain(domainFixed)) {
                    logConsoleError('Can\'t write cookie on domain ' + domain);
                } else {
                    configCookieDomain = domainFixed;
                    updateDomainHash();
                }
            };

            /**
             * Set an array of query parameters to be excluded if in the url
             *
             * @param string|array excludedQueryParams  'uid' or ['uid', 'sid']
             */
            this.setExcludedQueryParams = function (excludedQueryParams) {
                configExcludedQueryParams = isString(excludedQueryParams) ? [excludedQueryParams] : excludedQueryParams;
            };

            /**
             * Get first-party cookie domain
             */
            this.getCookieDomain = function () {
                return configCookieDomain;
            };

            /**
             * Detect if cookies are enabled and supported by browser.
             */
            this.hasCookies = function () {
                return '1' === hasCookies();
            };

            /**
             * Set a first-party cookie for the duration of the session.
             *
             * @param string cookieName
             * @param string cookieValue
             * @param int msToExpire Defaults to session cookie timeout
             */
            this.setSessionCookie = function (cookieName, cookieValue, msToExpire) {
                if (!cookieName) {
                    throw new Error('Missing cookie name');
                }

                if (!isDefined(msToExpire)) {
                    msToExpire = configSessionCookieTimeout;
                }

                configCookiesToDelete.push(cookieName);

                setCookie(getCookieName(cookieName), cookieValue, msToExpire, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
            };

            /**
             * Get first-party cookie value.
             *
             * Returns null if cookies are disabled or if no cookie could be found for this name.
             *
             * @param string cookieName
             */
            this.getCookie = function (cookieName) {
                var cookieValue = getCookie(getCookieName(cookieName));

                if (cookieValue === 0) {
                    return null;
                }

                return cookieValue;
            };

            /**
             * Set first-party cookie path.
             *
             * @param string domain
             */
            this.setCookiePath = function (path) {
                configCookiePath = path;
                updateDomainHash();
            };

            /**
             * Get first-party cookie path.
             *
             * @param string domain
             */
            this.getCookiePath = function (path) {
                return configCookiePath;
            };

            /**
             * Set visitor cookie timeout (in seconds)
             * Defaults to 13 months (timeout=33955200)
             *
             * @param int timeout
             */
            this.setVisitorCookieTimeout = function (timeout) {
                configVisitorCookieTimeout = timeout * 1000;
            };

            /**
             * Set session cookie timeout (in seconds).
             * Defaults to 30 minutes (timeout=1800)
             *
             * @param int timeout
             */
            this.setSessionCookieTimeout = function (timeout) {
                configSessionCookieTimeout = timeout * 1000;
            };

            /**
             * Get session cookie timeout (in seconds).
             */
            this.getSessionCookieTimeout = function () {
                return configSessionCookieTimeout;
            };

            /**
             * Set referral cookie timeout (in seconds).
             * Defaults to 6 months (15768000000)
             *
             * @param int timeout
             */
            this.setReferralCookieTimeout = function (timeout) {
                configReferralCookieTimeout = timeout * 1000;
            };

            /**
             * Set conversion attribution to first referrer and campaign
             *
             * @param bool if true, use first referrer (and first campaign)
             *             if false, use the last referrer (or campaign)
             */
            this.setConversionAttributionFirstReferrer = function (enable) {
                configConversionAttributionFirstReferrer = enable;
            };

            /**
             * Enable the Secure cookie flag on all first party cookies.
             * This should be used when your website is only available under HTTPS
             * so that all tracking cookies are always sent over secure connection.
             *
             * Warning: If your site is available under http and https,
             * setting this might lead to duplicate or incomplete visits.
             *
             * @param bool
             */
            this.setSecureCookie = function (enable) {
                if(enable && location.protocol !== 'https:') {
                    logConsoleError("Error in setSecureCookie: You cannot use `Secure` on http.");
                    return;
                }
                configCookieIsSecure = enable;
            };

            /**
             * Set the SameSite attribute for cookies to a custom value.
             * You might want to use this if your site is running in an iframe since
             * then it will only be able to access the cookies if SameSite is set to 'None'.
             *
             *
             * Warning:
             * Sets CookieIsSecure to true on None, because None will only work with Secure; cookies
             * If your site is available under http and https,
             * using "None" might lead to duplicate or incomplete visits.
             *
             * @param string either Lax, None or Strict
             */
            this.setCookieSameSite = function (sameSite) {
                sameSite = String(sameSite);
                sameSite = sameSite.charAt(0).toUpperCase() + sameSite.toLowerCase().slice(1);
                if (sameSite !== 'None' && sameSite !== 'Lax' && sameSite !== 'Strict') {
                    logConsoleError('Ignored value for sameSite. Please use either Lax, None, or Strict.');
                    return;
                }
                if (sameSite === 'None') {
                    if (location.protocol === 'https:') {
                        this.setSecureCookie(true);
                    } else {
                        logConsoleError('sameSite=None cannot be used on http, reverted to sameSite=Lax.');
                        sameSite = 'Lax';
                    }
                }
                configCookieSameSite = sameSite;
            };

            /**
             * Disables all cookies from being set
             *
             * Existing cookies will be deleted on the next call to track
             */
            this.disableCookies = function () {
                configCookiesDisabled = true;

                if (configTrackerSiteId) {
                    deleteCookies();
                }
            };

            /**
             * Detects if cookies are enabled or not
             * @returns {boolean}
             */
            this.areCookiesEnabled = function () {
                return !configCookiesDisabled;
            };

            /**
             * Enables cookies if they were disabled previously.
             */
            this.setCookieConsentGiven = function () {
                if (configCookiesDisabled && !configDoNotTrack) {
                    configCookiesDisabled = false;
                    configBrowserFeatureDetection = true;
                    if (configTrackerSiteId && hasSentTrackingRequestYet) {
                        setVisitorIdCookie();

                        // sets attribution cookie, and updates visitorId in the backend
                        // because hasSentTrackingRequestYet=true we assume there might not be another tracking
                        // request within this page view so we trigger one ourselves.
                        // if no tracking request has been sent yet, we don't set the attribution cookie cause Matomo
                        // sets the cookie only when there is a tracking request. It'll be set if the user sends
                        // a tracking request afterwards
                        var request = getRequest('ping=1', null, 'ping');
                        sendRequest(request, configTrackerPause);
                    }
                }
            };

            /**
             * When called, no cookies will be set until you have called `setCookieConsentGiven()`
             * unless consent was given previously AND you called {@link rememberCookieConsentGiven()} when the user
             * gave consent.
             *
             * This may be useful when you want to implement for example a popup to ask for cookie consent.
             * Once the user has given consent, you should call {@link setCookieConsentGiven()}
             * or {@link rememberCookieConsentGiven()}.
             *
             * If you require tracking consent for example because you are tracking personal data and GDPR applies to you,
             * then have a look at `_paq.push(['requireConsent'])` instead.
             *
             * If the user has already given consent in the past, you can either decide to not call `requireCookieConsent` at all
             * or call `_paq.push(['setCookieConsentGiven'])` on each page view at any time after calling `requireCookieConsent`.
             *
             * When the user gives you the consent to set cookies, you can also call `_paq.push(['rememberCookieConsentGiven', optionalTimeoutInHours])`
             * and for the duration while the cookie consent is remembered, any call to `requireCoookieConsent` will be automatically ignored
             * until you call `forgetCookieConsentGiven`.
             * `forgetCookieConsentGiven` needs to be called when the user removes consent for using cookies. This means if you call `rememberCookieConsentGiven` at the
             * time the user gives you consent, you do not need to ever call `_paq.push(['setCookieConsentGiven'])` as the consent
             * will be detected automatically through cookies.
             */
            this.requireCookieConsent = function() {
                if (this.getRememberedCookieConsent()) {
                    return false;
                }
                this.disableCookies();
                return true;
            };

            /**
             * If the user has given cookie consent previously and this consent was remembered, it will return the number
             * in milliseconds since 1970/01/01 which is the date when the user has given cookie consent. Please note that
             * the returned time depends on the users local time which may not always be correct.
             *
             * @returns number|string
             */
            this.getRememberedCookieConsent = function () {
                return getCookie(COOKIE_CONSENT_COOKIE_NAME);
            };

            /**
             * Calling this method will remove any previously given cookie consent and it disables cookies for subsequent
             * page views. You may call this method if the user removes cookie consent manually, or if you
             * want to re-ask for cookie consent after a specific time period.
             */
            this.forgetCookieConsentGiven = function () {
                deleteCookie(COOKIE_CONSENT_COOKIE_NAME, configCookiePath, configCookieDomain);
                this.disableCookies();
            };

            /**
             * Calling this method will remember that the user has given cookie consent across multiple requests by setting
             * a cookie named "mtm_cookie_consent". You can optionally define the lifetime of that cookie in hours
             * using a parameter.
             *
             * When you call this method, we imply that the user has given cookie consent for this page view, and will also
             * imply consent for all future page views unless the cookie expires or the user
             * deletes all their cookies. Remembering cookie consent means even if you call {@link disableCookies()},
             * then cookies will still be enabled and it won't disable cookies since the user has given consent for cookies.
             *
             * Please note that this feature requires you to set the `cookieDomain` and `cookiePath` correctly. Please
             * also note that when you call this method, consent will be implied for all sites that match the configured
             * cookieDomain and cookiePath. Depending on your website structure, you may need to restrict or widen the
             * scope of the cookie domain/path to ensure the consent is applied to the sites you want.
             *
             * @param int hoursToExpire After how many hours the cookie consent should expire. By default the consent is valid
             *                          for 30 years unless cookies are deleted by the user or the browser prior to this
             */
            this.rememberCookieConsentGiven = function (hoursToExpire) {
                if (hoursToExpire) {
                    hoursToExpire = hoursToExpire * 60 * 60 * 1000;
                } else {
                    hoursToExpire = 30 * 365 * 24 * 60 * 60 * 1000;
                }
                this.setCookieConsentGiven();
                var now = new Date().getTime();
                setCookie(COOKIE_CONSENT_COOKIE_NAME, now, hoursToExpire, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
            };

            /**
             * One off cookies clearing. Useful to call this when you know for sure a new visitor is using the same browser,
             * it maybe helps to "reset" tracking cookies to prevent data reuse for different users.
             */
            this.deleteCookies = function () {
                deleteCookies();
            };

            /**
             * Handle do-not-track requests
             *
             * @param bool enable If true, don't track if user agent sends 'do-not-track' header
             */
            this.setDoNotTrack = function (enable) {
                var dnt = navigatorAlias.doNotTrack || navigatorAlias.msDoNotTrack;
                configDoNotTrack = enable && (dnt === 'yes' || dnt === '1');

                // do not track also disables cookies and deletes existing cookies
                if (configDoNotTrack) {
                    this.disableCookies();
                }
            };

            /**
             * Enables send beacon usage instead of regular XHR which reduces the link tracking time to a minimum
             * of 100ms instead of 500ms (default). This means when a user clicks for example on an outlink, the
             * navigation to this page will happen 400ms faster.
             * In case you are setting a callback method when issuing a tracking request, the callback method will
             *  be executed as soon as the tracking request was sent through "sendBeacon" and not after the tracking
             *  request finished as it is not possible to find out when the request finished.
             * Send beacon will only be used if the browser actually supports it.
             */
            this.alwaysUseSendBeacon = function () {
                configAlwaysUseSendBeacon = true;
            };

            /**
             * Disables send beacon usage instead and instead enables using regular XHR when possible. This makes
             * callbacks work and also tracking requests will appear in the browser developer tools console.
             */
            this.disableAlwaysUseSendBeacon = function () {
                configAlwaysUseSendBeacon = false;
            };

            /**
             * Add click listener to a specific link element.
             * When clicked, Matomo will log the click automatically.
             *
             * @param DOMElement element
             * @param bool enable If false, do not use pseudo click-handler (middle click + context menu)
             */
            this.addListener = function (element, enable) {
                addClickListener(element, enable, false);
            };

            /**
             * Install link tracker.
             *
             * If you change the DOM of your website or web application Matomo will automatically detect links
             * that were added newly.
             *
             * The default behaviour is to use actual click events. However, some browsers
             * (e.g., Firefox, Opera, and Konqueror) don't generate click events for the middle mouse button.
             *
             * To capture more "clicks", the pseudo click-handler uses mousedown + mouseup events.
             * This is not industry standard and is vulnerable to false positives (e.g., drag events).
             *
             * There is a Safari/Chrome/Webkit bug that prevents tracking requests from being sent
             * by either click handler.  The workaround is to set a target attribute (which can't
             * be "_self", "_top", or "_parent").
             *
             * @see https://bugs.webkit.org/show_bug.cgi?id=54783
             *
             * @param bool enable Defaults to true.
             *                    * If "true", use pseudo click-handler (treat middle click and open contextmenu as
             *                    left click). A right click (or any click that opens the context menu) on a link
             *                    will be tracked as clicked even if "Open in new tab" is not selected.
             *                    * If "false" (default), nothing will be tracked on open context menu or middle click.
             *                    The context menu is usually opened to open a link / download in a new tab
             *                    therefore you can get more accurate results by treat it as a click but it can lead
             *                    to wrong click numbers.
             */
            this.enableLinkTracking = function (enable) {
                if (linkTrackingEnabled) {
                    return;
                }
                linkTrackingEnabled = true;

                var self = this;

                trackCallbackOnReady(function () {
                    linkTrackingInstalled = true;

                    var element = documentAlias.body;
                    addClickListener(element, enable, true);
                });

            };

            /**
             * Enable tracking of uncatched JavaScript errors
             *
             * If enabled, uncaught JavaScript Errors will be tracked as an event by defining a
             * window.onerror handler. If a window.onerror handler is already defined we will make
             * sure to call this previously registered error handler after tracking the error.
             *
             * By default we return false in the window.onerror handler to make sure the error still
             * appears in the browser's console etc. Note: Some older browsers might behave differently
             * so it could happen that an actual JavaScript error will be suppressed.
             * If a window.onerror handler was registered we will return the result of this handler.
             *
             * Make sure not to overwrite the window.onerror handler after enabling the JS error
             * tracking as the error tracking won't work otherwise. To capture all JS errors we
             * recommend to include the Matomo JavaScript tracker in the HTML as early as possible.
             * If possible directly in <head></head> before loading any other JavaScript.
             */
            this.enableJSErrorTracking = function () {
                if (enableJSErrorTracking) {
                    return;
                }

                enableJSErrorTracking = true;
                var onError = windowAlias.onerror;

                windowAlias.onerror = function (message, url, linenumber, column, error) {
                    trackCallback(function () {
                        var category = 'JavaScript Errors';

                        var action = url + ':' + linenumber;
                        if (column) {
                            action += ':' + column;
                        }

                        if (indexOfArray(javaScriptErrors, category + action + message) === -1) {
                            javaScriptErrors.push(category + action + message);

                            logEvent(category, action, message);
                        }
                    });

                    if (onError) {
                        return onError(message, url, linenumber, column, error);
                    }

                    return false;
                };
            };

            /**
             * Disable automatic performance tracking
             */
            this.disablePerformanceTracking = function () {
                configPerformanceTrackingEnabled = false;
            };

            /**
             * Set heartbeat (in seconds)
             *
             * @param int heartBeatDelayInSeconds Defaults to 15s. Cannot be lower than 5.
             */
            this.enableHeartBeatTimer = function (heartBeatDelayInSeconds) {
                heartBeatDelayInSeconds = Math.max(heartBeatDelayInSeconds || 15, 5);
                configHeartBeatDelay = heartBeatDelayInSeconds * 1000;

                // if a tracking request has already been sent, start the heart beat timeout
                if (lastTrackerRequestTime !== null) {
                    setUpHeartBeat();
                }
            };

            /**
             * Disable heartbeat if it was previously activated.
             */
            this.disableHeartBeatTimer = function () {

                if (configHeartBeatDelay || heartBeatSetUp) {
                    if (windowAlias.removeEventListener) {
                        windowAlias.removeEventListener('focus', heartBeatOnFocus);
                        windowAlias.removeEventListener('blur', heartBeatOnBlur);
                        windowAlias.removeEventListener('visibilitychange', heartBeatOnVisible);
                    } else if  (windowAlias.detachEvent) {
                        windowAlias.detachEvent('onfocus', heartBeatOnFocus);
                        windowAlias.detachEvent('onblur', heartBeatOnBlur);
                        windowAlias.detachEvent('visibilitychange', heartBeatOnVisible);
                    }
                }

                configHeartBeatDelay = null;
                heartBeatSetUp = false;
            };

            /**
             * Frame buster
             */
            this.killFrame = function () {
                if (windowAlias.location !== windowAlias.top.location) {
                    windowAlias.top.location = windowAlias.location;
                }
            };

            /**
             * Redirect if browsing offline (aka file: buster)
             *
             * @param string url Redirect to this URL
             */
            this.redirectFile = function (url) {
                if (windowAlias.location.protocol === 'file:') {
                    windowAlias.location = url;
                }
            };

            /**
             * Count sites in pre-rendered state
             *
             * @param bool enable If true, track when in pre-rendered state
             */
            this.setCountPreRendered = function (enable) {
                configCountPreRendered = enable;
            };

            /**
             * Trigger a goal
             *
             * @param int|string idGoal
             * @param int|float customRevenue
             * @param mixed customData
             * @param function callback
             */
            this.trackGoal = function (idGoal, customRevenue, customData, callback) {
                trackCallback(function () {
                    logGoal(idGoal, customRevenue, customData, callback);
                });
            };

            /**
             * Manually log a click from your own code
             *
             * @param string sourceUrl
             * @param string linkType
             * @param mixed customData
             * @param function callback
             */
            this.trackLink = function (sourceUrl, linkType, customData, callback) {
                trackCallback(function () {
                    logLink(sourceUrl, linkType, customData, callback);
                });
            };

            /**
             * Get the number of page views that have been tracked so far within the currently loaded page.
             */
            this.getNumTrackedPageViews = function () {
                return numTrackedPageviews;
            };

            /**
             * Log visit to this page
             *
             * @param string customTitle
             * @param mixed customData
             * @param function callback
             */
            this.trackPageView = function (customTitle, customData, callback) {
                trackedContentImpressions = [];
                consentRequestsQueue = [];
                javaScriptErrors = [];

                if (isOverlaySession(configTrackerSiteId)) {
                    trackCallback(function () {
                        injectOverlayScripts(configTrackerUrl, configApiUrl, configTrackerSiteId);
                    });
                } else {
                    trackCallback(function () {
                        numTrackedPageviews++;
                        logPageView(customTitle, customData, callback);
                    });
                }
            };

            this.disableBrowserFeatureDetection = function () {
                configBrowserFeatureDetection = false;
            };

            this.enableBrowserFeatureDetection = function () {
                configBrowserFeatureDetection = true;
            };

            /**
             * Scans the entire DOM for all content blocks and tracks all impressions once the DOM ready event has
             * been triggered.
             *
             * If you only want to track visible content impressions have a look at `trackVisibleContentImpressions()`.
             * We do not track an impression of the same content block twice if you call this method multiple times
             * unless `trackPageView()` is called meanwhile. This is useful for single page applications.
             */
            this.trackAllContentImpressions = function () {
                if (isOverlaySession(configTrackerSiteId)) {
                    return;
                }

                trackCallback(function () {
                    trackCallbackOnReady(function () {
                        // we have to wait till DOM ready
                        var contentNodes = content.findContentNodes();
                        var requests     = getContentImpressionsRequestsFromNodes(contentNodes);

                        requestQueue.pushMultiple(requests);
                    });
                });
            };

            /**
             * Scans the entire DOM for all content blocks as soon as the page is loaded. It tracks an impression
             * only if a content block is actually visible. Meaning it is not hidden and the content is or was at
             * some point in the viewport.
             *
             * If you want to track all content blocks have a look at `trackAllContentImpressions()`.
             * We do not track an impression of the same content block twice if you call this method multiple times
             * unless `trackPageView()` is called meanwhile. This is useful for single page applications.
             *
             * Once you have called this method you can no longer change `checkOnScroll` or `timeIntervalInMs`.
             *
             * If you do want to only track visible content blocks but not want us to perform any automatic checks
             * as they can slow down your frames per second you can call `trackVisibleContentImpressions()` or
             * `trackContentImpressionsWithinNode()` manually at  any time to rescan the entire DOM for newly
             * visible content blocks.
             * o Call `trackVisibleContentImpressions(false, 0)` to initially track only visible content impressions
             * o Call `trackVisibleContentImpressions()` at any time again to rescan the entire DOM for newly visible content blocks or
             * o Call `trackContentImpressionsWithinNode(node)` at any time to rescan only a part of the DOM for newly visible content blocks
             *
             * @param boolean [checkOnScroll=true] Optional, you can disable rescanning the entire DOM automatically
             *                                     after each scroll event by passing the value `false`. If enabled,
             *                                     we check whether a previously hidden content blocks became visible
             *                                     after a scroll and if so track the impression.
             *                                     Note: If a content block is placed within a scrollable element
             *                                     (`overflow: scroll`), we can currently not detect when this block
             *                                     becomes visible.
             * @param integer [timeIntervalInMs=750] Optional, you can define an interval to rescan the entire DOM
             *                                     for new impressions every X milliseconds by passing
             *                                     for instance `timeIntervalInMs=500` (rescan DOM every 500ms).
             *                                     Rescanning the entire DOM and detecting the visible state of content
             *                                     blocks can take a while depending on the browser and amount of content.
             *                                     In case your frames per second goes down you might want to increase
             *                                     this value or disable it by passing the value `0`.
             */
            this.trackVisibleContentImpressions = function (checkOnScroll, timeIntervalInMs) {
                if (isOverlaySession(configTrackerSiteId)) {
                    return;
                }

                if (!isDefined(checkOnScroll)) {
                    checkOnScroll = true;
                }

                if (!isDefined(timeIntervalInMs)) {
                    timeIntervalInMs = 750;
                }

                enableTrackOnlyVisibleContent(checkOnScroll, timeIntervalInMs, this);

                trackCallback(function () {
                    trackCallbackOnLoad(function () {
                        // we have to wait till CSS parsed and applied
                        var contentNodes = content.findContentNodes();
                        var requests     = getCurrentlyVisibleContentImpressionsRequestsIfNotTrackedYet(contentNodes);

                        requestQueue.pushMultiple(requests);
                    });
                });
            };

            /**
             * Tracks a content impression using the specified values. You should not call this method too often
             * as each call causes an XHR tracking request and can slow down your site or your server.
             *
             * @param string contentName  For instance "Ad Sale".
             * @param string [contentPiece='Unknown'] For instance a path to an image or the text of a text ad.
             * @param string [contentTarget] For instance the URL of a landing page.
             */
            this.trackContentImpression = function (contentName, contentPiece, contentTarget) {
                if (isOverlaySession(configTrackerSiteId)) {
                    return;
                }

                contentName = trim(contentName);
                contentPiece = trim(contentPiece);
                contentTarget = trim(contentTarget);

                if (!contentName) {
                    return;
                }

                contentPiece = contentPiece || 'Unknown';

                trackCallback(function () {
                    var request = buildContentImpressionRequest(contentName, contentPiece, contentTarget);
                    requestQueue.push(request);
                });
            };

            /**
             * Scans the given DOM node and its children for content blocks and tracks an impression for them if
             * no impression was already tracked for it. If you have called `trackVisibleContentImpressions()`
             * upfront only visible content blocks will be tracked. You can use this method if you, for instance,
             * dynamically add an element using JavaScript to your DOM after we have tracked the initial impressions.
             *
             * @param Element domNode
             */
            this.trackContentImpressionsWithinNode = function (domNode) {
                if (isOverlaySession(configTrackerSiteId) || !domNode) {
                    return;
                }

                trackCallback(function () {
                    if (isTrackOnlyVisibleContentEnabled) {
                        trackCallbackOnLoad(function () {
                            // we have to wait till CSS parsed and applied
                            var contentNodes = content.findContentNodesWithinNode(domNode);

                            var requests = getCurrentlyVisibleContentImpressionsRequestsIfNotTrackedYet(contentNodes);
                            requestQueue.pushMultiple(requests);
                        });
                    } else {
                        trackCallbackOnReady(function () {
                            // we have to wait till DOM ready
                            var contentNodes = content.findContentNodesWithinNode(domNode);

                            var requests = getContentImpressionsRequestsFromNodes(contentNodes);
                            requestQueue.pushMultiple(requests);
                        });
                    }
                });
            };

            /**
             * Tracks a content interaction using the specified values. You should use this method only in conjunction
             * with `trackContentImpression()`. The specified `contentName` and `contentPiece` has to be exactly the
             * same as the ones that were used in `trackContentImpression()`. Otherwise the interaction will not count.
             *
             * @param string contentInteraction The type of interaction that happened. For instance 'click' or 'submit'.
             * @param string contentName  The name of the content. For instance "Ad Sale".
             * @param string [contentPiece='Unknown'] The actual content. For instance a path to an image or the text of a text ad.
             * @param string [contentTarget] For instance the URL of a landing page.
             */
            this.trackContentInteraction = function (contentInteraction, contentName, contentPiece, contentTarget) {
                if (isOverlaySession(configTrackerSiteId)) {
                    return;
                }

                contentInteraction = trim(contentInteraction);
                contentName = trim(contentName);
                contentPiece = trim(contentPiece);
                contentTarget = trim(contentTarget);

                if (!contentInteraction || !contentName) {
                    return;
                }

                contentPiece = contentPiece || 'Unknown';

                trackCallback(function () {
                    var request = buildContentInteractionRequest(contentInteraction, contentName, contentPiece, contentTarget);
                    if (request) {
                        requestQueue.push(request);
                    }
                });
            };

            /**
             * Tracks an interaction with the given DOM node / content block.
             *
             * By default we track interactions on click but sometimes you might want to track interactions yourself.
             * For instance you might want to track an interaction manually on a double click or a form submit.
             * Make sure to disable the automatic interaction tracking in this case by specifying either the CSS
             * class `matomoContentIgnoreInteraction` or the attribute `data-content-ignoreinteraction`.
             *
             * @param Element domNode  This element itself or any of its parent elements has to be a content block
             *                         element. Meaning one of those has to have a `matomoTrackContent` CSS class or
             *                         a `data-track-content` attribute.
             * @param string [contentInteraction='Unknown] The name of the interaction that happened. For instance
             *                                             'click', 'formSubmit', 'DblClick', ...
             */
            this.trackContentInteractionNode = function (domNode, contentInteraction) {
                if (isOverlaySession(configTrackerSiteId) || !domNode) {
                    return;
                }

                var theRequest = null;

                trackCallback(function () {
                    theRequest = buildContentInteractionRequestNode(domNode, contentInteraction);
                    if (theRequest) {
                        requestQueue.push(theRequest);
                    }
                });
                //note: return value is only for tests... will only work if dom is already ready...
                return theRequest;
            };

            /**
             * Useful to debug content tracking. This method will log all detected content blocks to console
             * (if the browser supports the console). It will list the detected name, piece, and target of each
             * content block.
             */
            this.logAllContentBlocksOnPage = function () {
                var contentNodes = content.findContentNodes();
                var contents = content.collectContent(contentNodes);

                // needed to write it this way for jslint
                var consoleType = typeof console;
                if (consoleType !== 'undefined' && console && console.log) {
                    console.log(contents);
                }
            };

            /**
             * Records an event
             *
             * @param string category The Event Category (Videos, Music, Games...)
             * @param string action The Event's Action (Play, Pause, Duration, Add Playlist, Downloaded, Clicked...)
             * @param string name (optional) The Event's object Name (a particular Movie name, or Song name, or File name...)
             * @param float value (optional) The Event's value
             * @param function callback
             * @param mixed customData
             */
            this.trackEvent = function (category, action, name, value, customData, callback) {
                trackCallback(function () {
                    logEvent(category, action, name, value, customData, callback);
                });
            };

            /**
             * Log special pageview: Internal search
             *
             * @param string keyword
             * @param string category
             * @param int resultsCount
             * @param mixed customData
             */
            this.trackSiteSearch = function (keyword, category, resultsCount, customData) {
                trackedContentImpressions = [];
                trackCallback(function () {
                    logSiteSearch(keyword, category, resultsCount, customData);
                });
            };

            /**
             * Used to record that the current page view is an item (product) page view, or a Ecommerce Category page view.
             * This must be called before trackPageView() on the product/category page.
             *
             * On a category page, you can set the parameter category, and set the other parameters to empty string or false
             *
             * Tracking Product/Category page views will allow Matomo to report on Product & Categories
             * conversion rates (Conversion rate = Ecommerce orders containing this product or category / Visits to the product or category)
             *
             * @param string sku Item's SKU code being viewed
             * @param string name Item's Name being viewed
             * @param string category Category page being viewed. On an Item's page, this is the item's category
             * @param float price Item's display price, not use in standard Matomo reports, but output in API product reports.
             */
            this.setEcommerceView = function (sku, name, category, price) {
                ecommerceProductView = {};

                if (isNumberOrHasLength(category)) {
                    category = String(category);
                }
                if (!isDefined(category) || category === null || category === false || !category.length) {
                    category = "";
                } else if (category instanceof Array) {
                    category = windowAlias.JSON.stringify(category);
                }

                var param = '_pkc';
                ecommerceProductView[param] = category;

                if (isDefined(price) && price !== null && price !== false && String(price).length) {
                    param = '_pkp';
                    ecommerceProductView[param] = price;
                }

                // On a category page, do not track Product name not defined
                if (!isNumberOrHasLength(sku) && !isNumberOrHasLength(name)) {
                    return;
                }

                if (isNumberOrHasLength(sku)) {
                    param = '_pks';
                    ecommerceProductView[param] = sku;
                }

                if (!isNumberOrHasLength(name)) {
                    name = "";
                }

                param = '_pkn';
                ecommerceProductView[param] = name;
            };

            /**
             * Returns the list of ecommerce items that will be sent when a cart update or order is tracked.
             * The returned value is read-only, modifications will not change what will be tracked. Use
             * addEcommerceItem/removeEcommerceItem/clearEcommerceCart to modify what items will be tracked.
             *
             * Note: the cart will be cleared after an order.
             *
             * @returns array
             */
            this.getEcommerceItems = function () {
                return JSON.parse(JSON.stringify(ecommerceItems));
            };

            /**
             * Adds an item (product) that is in the current Cart or in the Ecommerce order.
             * This function is called for every item (product) in the Cart or the Order.
             * The only required parameter is sku.
             * The items are deleted from this JavaScript object when the Ecommerce order is tracked via the method trackEcommerceOrder.
             *
             * If there is already a saved item for the given sku, it will be updated with the
             * new information.
             *
             * @param string sku (required) Item's SKU Code. This is the unique identifier for the product.
             * @param string name (optional) Item's name
             * @param string name (optional) Item's category, or array of up to 5 categories
             * @param float price (optional) Item's price. If not specified, will default to 0
             * @param float quantity (optional) Item's quantity. If not specified, will default to 1
             */
            this.addEcommerceItem = function (sku, name, category, price, quantity) {
                if (isNumberOrHasLength(sku)) {
                    ecommerceItems[sku] = [ String(sku), name, category, price, quantity ];
                }
            };

            /**
             * Removes a single ecommerce item by SKU from the current cart.
             *
             * @param string sku (required) Item's SKU Code. This is the unique identifier for the product.
             */
            this.removeEcommerceItem = function (sku) {
                if (isNumberOrHasLength(sku)) {
                    sku = String(sku);
                    delete ecommerceItems[sku];
                }
            };

            /**
             * Clears the current cart, removing all saved ecommerce items. Call this method to manually clear
             * the cart before sending an ecommerce order.
             */
            this.clearEcommerceCart = function () {
                ecommerceItems = {};
            };

            /**
             * Tracks an Ecommerce order.
             * If the Ecommerce order contains items (products), you must call first the addEcommerceItem() for each item in the order.
             * All revenues (grandTotal, subTotal, tax, shipping, discount) will be individually summed and reported in Matomo reports.
             * Parameters orderId and grandTotal are required. For others, you can set to false if you don't need to specify them.
             * After calling this method, items added to the cart will be removed from this JavaScript object.
             *
             * @param string|int orderId (required) Unique Order ID.
             *                   This will be used to count this order only once in the event the order page is reloaded several times.
             *                   orderId must be unique for each transaction, even on different days, or the transaction will not be recorded by Matomo.
             * @param float grandTotal (required) Grand Total revenue of the transaction (including tax, shipping, etc.)
             * @param float subTotal (optional) Sub total amount, typically the sum of items prices for all items in this order (before Tax and Shipping costs are applied)
             * @param float tax (optional) Tax amount for this order
             * @param float shipping (optional) Shipping amount for this order
             * @param float discount (optional) Discounted amount in this order
             */
            this.trackEcommerceOrder = function (orderId, grandTotal, subTotal, tax, shipping, discount) {
                logEcommerceOrder(orderId, grandTotal, subTotal, tax, shipping, discount);
            };

            /**
             * Tracks a Cart Update (add item, remove item, update item).
             * On every Cart update, you must call addEcommerceItem() for each item (product) in the cart, including the items that haven't been updated since the last cart update.
             * Then you can call this function with the Cart grandTotal (typically the sum of all items' prices)
             * Calling this method does not remove from this JavaScript object the items that were added to the cart via addEcommerceItem
             *
             * @param float grandTotal (required) Items (products) amount in the Cart
             */
            this.trackEcommerceCartUpdate = function (grandTotal) {
                logEcommerceCartUpdate(grandTotal);
            };

            /**
             * Sends a tracking request with custom request parameters.
             * Matomo will prepend the hostname and path to Matomo, as well as all other needed tracking request
             * parameters prior to sending the request. Useful eg if you track custom dimensions via a plugin.
             *
             * @param request eg. "param=value&param2=value2"
             * @param customData
             * @param callback
             * @param pluginMethod
             */
            this.trackRequest = function (request, customData, callback, pluginMethod) {
                trackCallback(function () {
                    var fullRequest = getRequest(request, customData, pluginMethod);
                    sendRequest(fullRequest, configTrackerPause, callback);
                });
            };

            /**
             * Sends a ping request.
             *
             * Ping requests do not track new actions. If they are sent within the standard visit length, they will
             * extend the existing visit and the current last action for the visit. If after the standard visit
             * length, ping requests will create a new visit using the last action in the last known visit.
             */
            this.ping = function () {
                this.trackRequest('ping=1', null, null, 'ping');
            };

            /**
             * Disables sending requests queued
             */
            this.disableQueueRequest = function () {
                requestQueue.enabled = false;
            };

            /**
             * Defines after how many ms a queued requests will be executed after the request was queued initially.
             * The higher the value the more tracking requests can be send together at once.
             */
            this.setRequestQueueInterval = function (interval) {
                if (interval < 1000) {
                    throw new Error('Request queue interval needs to be at least 1000ms');
                }
                requestQueue.interval = interval;
            };

            /**
             * Won't send the tracking request directly but wait for a short time to possibly send this tracking request
             * along with other tracking requests in one go. This can reduce the number of requests send to your server.
             * If the page unloads (user navigates to another page or closes the browser), then all remaining queued
             * requests will be sent immediately so that no tracking request gets lost.
             * Note: Any queued request may not be possible to be replayed in case a POST request is sent. Only queue
             * requests that don't have to be replayed.
             *
             * @param request eg. "param=value&param2=value2"
             */
            this.queueRequest = function (request) {
                trackCallback(function () {
                    var fullRequest = getRequest(request);
                    requestQueue.push(fullRequest);
                });
            };

            /**
             * Returns whether consent is required or not.
             *
             * @returns boolean
             */
            this.isConsentRequired = function()
            {
                return configConsentRequired;
            };

            /**
             * If the user has given consent previously and this consent was remembered, it will return the number
             * in milliseconds since 1970/01/01 which is the date when the user has given consent. Please note that
             * the returned time depends on the users local time which may not always be correct.
             *
             * @returns number|string
             */
            this.getRememberedConsent = function () {
                var value = getCookie(CONSENT_COOKIE_NAME);
                if (getCookie(CONSENT_REMOVED_COOKIE_NAME)) {
                    // if for some reason the consent_removed cookie is also set with the consent cookie, the
                    // consent_removed cookie overrides the consent one, and we make sure to delete the consent
                    // cookie.
                    if (value) {
                        deleteCookie(CONSENT_COOKIE_NAME, configCookiePath, configCookieDomain);
                    }
                    return null;
                }

                if (!value || value === 0) {
                    return null;
                }
                return value;
            };

            /**
             * Detects whether the user has given consent previously.
             *
             * @returns bool
             */
            this.hasRememberedConsent = function () {
                return !!this.getRememberedConsent();
            };

            /**
             * When called, no tracking request will be sent to the Matomo server until you have called `setConsentGiven()`
             * unless consent was given previously AND you called {@link rememberConsentGiven()} when the user gave their
             * consent.
             *
             * This may be useful when you want to implement for example a popup to ask for consent before tracking the user.
             * Once the user has given consent, you should call {@link setConsentGiven()} or {@link rememberConsentGiven()}.
             *
             * If you require consent for tracking personal data for example, you should first call
             * `_paq.push(['requireConsent'])`.
             *
             * If the user has already given consent in the past, you can either decide to not call `requireConsent` at all
             * or call `_paq.push(['setConsentGiven'])` on each page view at any time after calling `requireConsent`.
             *
             * When the user gives you the consent to track data, you can also call `_paq.push(['rememberConsentGiven', optionalTimeoutInHours])`
             * and for the duration while the consent is remembered, any call to `requireConsent` will be automatically ignored until you call `forgetConsentGiven`.
             * `forgetConsentGiven` needs to be called when the user removes consent for tracking. This means if you call `rememberConsentGiven` at the
             * time the user gives you consent, you do not need to ever call `_paq.push(['setConsentGiven'])`.
             */
            this.requireConsent = function () {
                configConsentRequired = true;
                configHasConsent = this.hasRememberedConsent();
                if (!configHasConsent) {
                    // we won't call this.disableCookies() since we don't want to delete any cookies just yet
                    // user might call `setConsentGiven` next
                    configCookiesDisabled = true;
                }
                // Matomo.addPlugin might not be defined at this point, we add the plugin directly also to make JSLint happy
                // We also want to make sure to define an unload listener for each tracker, not only one tracker.
                coreConsentCounter++;
                plugins['CoreConsent' + coreConsentCounter] = {
                    unload: function () {
                        if (!configHasConsent) {
                            // we want to make sure to remove all previously set cookies again
                            deleteCookies();
                        }
                    }
                };
            };

            /**
             * Call this method once the user has given consent. This will cause all tracking requests from this
             * page view to be sent. Please note that the given consent won't be remembered across page views. If you
             * want to remember consent across page views, call {@link rememberConsentGiven()} instead.
             *
             * It will also automatically enable cookies if they were disabled previously.
             *
             * @param bool [setCookieConsent=true] Internal parameter. Defines whether cookies should be enabled or not.
             */
            this.setConsentGiven = function (setCookieConsent) {
                configHasConsent = true;
                configBrowserFeatureDetection = true;
                deleteCookie(CONSENT_REMOVED_COOKIE_NAME, configCookiePath, configCookieDomain);

                var i, requestType;
                for (i = 0; i < consentRequestsQueue.length; i++) {
                    requestType = typeof consentRequestsQueue[i];
                    if (requestType === 'string') {
                        sendRequest(consentRequestsQueue[i], configTrackerPause);
                    } else if (requestType === 'object') {
                        sendBulkRequest(consentRequestsQueue[i], configTrackerPause);
                    }
                }
                consentRequestsQueue = [];

                // we need to enable cookies after sending the previous requests as it will make sure that we send
                // a ping request if needed. Cookies are only set once we call `getRequest`. Above only calls sendRequest
                // meaning no cookies will be created unless we called enableCookies after at least one request has been sent.
                // this will cause a ping request to be sent that sets the cookies and also updates the newly generated visitorId
                // on the server.
                // If the user calls setConsentGiven before sending any tracking request (which usually is the case) then
                // nothing will need to be done as it only enables cookies and the next tracking request will set the cookies
                // etc.
                if (!isDefined(setCookieConsent) || setCookieConsent) {
                    this.setCookieConsentGiven();
                }
            };

            /**
             * Calling this method will remember that the user has given consent across multiple requests by setting
             * a cookie. You can optionally define the lifetime of that cookie in hours using a parameter.
             *
             * When you call this method, we imply that the user has given consent for this page view, and will also
             * imply consent for all future page views unless the cookie expires (if timeout defined) or the user
             * deletes all their cookies. This means even if you call {@link requireConsent()}, then all requests
             * will still be tracked.
             *
             * Please note that this feature requires you to set the `cookieDomain` and `cookiePath` correctly and requires
             * that you do not disable cookies. Please also note that when you call this method, consent will be implied
             * for all sites that match the configured cookieDomain and cookiePath. Depending on your website structure,
             * you may need to restrict or widen the scope of the cookie domain/path to ensure the consent is applied
             * to the sites you want.
             *
             * @param int hoursToExpire After how many hours the consent should expire. By default the consent is valid
             *                          for 30 years unless cookies are deleted by the user or the browser prior to this
             */
            this.rememberConsentGiven = function (hoursToExpire) {
                if (hoursToExpire) {
                    hoursToExpire = hoursToExpire * 60 * 60 * 1000;
                } else {
                    hoursToExpire = 30 * 365 * 24 * 60 * 60 * 1000;
                }
                var setCookieConsent = true;
                // we currently always enable cookies if we remember consent cause we don't store across requests whether
                // cookies should be automatically enabled or not.
                this.setConsentGiven(setCookieConsent);
                var now = new Date().getTime();
                setCookie(CONSENT_COOKIE_NAME, now, hoursToExpire, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
            };

            /**
             * Calling this method will remove any previously given consent and during this page view no request
             * will be sent anymore ({@link requireConsent()}) will be called automatically to ensure the removed
             * consent will be enforced. You may call this method if the user removes consent manually, or if you
             * want to re-ask for consent after a specific time period.
             */
            this.forgetConsentGiven = function () {
                var thirtyYears = 30 * 365 * 24 * 60 * 60 * 1000;

                deleteCookie(CONSENT_COOKIE_NAME, configCookiePath, configCookieDomain);
                setCookie(CONSENT_REMOVED_COOKIE_NAME, new Date().getTime(), thirtyYears, configCookiePath, configCookieDomain, configCookieIsSecure, configCookieSameSite);
                this.forgetCookieConsentGiven();
                this.requireConsent();
            };

            /**
             * Returns true if user is opted out, false if otherwise.
             *
             * @returns {boolean}
             */
            this.isUserOptedOut = function () {
                return !configHasConsent;
            };

            /**
             * Alias for forgetConsentGiven(). After calling this function, the user will no longer be tracked,
             * (even if they come back to the site).
             */
            this.optUserOut = this.forgetConsentGiven;

            /**
             * Alias for rememberConsentGiven(). After calling this function, the current user will be tracked.
             */
            this.forgetUserOptOut = function () {
                // we can't automatically enable cookies here as we don't know if user actually gave consent for cookies
                this.setConsentGiven(false);
            };

            /**
             * Mark performance metrics as available, once onload event has finished
             */
            trackCallbackOnLoad(function(){
                setTimeout(function(){
                    performanceAvailable = true;
                }, 0);
            });

            Matomo.trigger('TrackerSetup', [this]);

            Matomo.addPlugin('TrackerVisitorIdCookie' + uniqueTrackerId, {
                // if no tracking request was sent we refresh the visitor id cookie on page unload
                unload: function () {
                    if (!hasSentTrackingRequestYet) {
                        setVisitorIdCookie();
                        // this will set the referrer attribution cookie
                        detectReferrerAttribution();
                    }
                }
            });
        }

        function TrackerProxy() {
            return {
                push: apply
            };
        }

        /**
         * Applies the given methods in the given order if they are present in paq.
         *
         * @param {Array} paq
         * @param {Array} methodsToApply an array containing method names in the order that they should be applied
         *                 eg ['setSiteId', 'setTrackerUrl']
         * @returns {Array} the modified paq array with the methods that were already applied set to undefined
         */
        function applyMethodsInOrder(paq, methodsToApply)
        {
            var appliedMethods = {};
            var index, iterator;

            for (index = 0; index < methodsToApply.length; index++) {
                var methodNameToApply = methodsToApply[index];
                appliedMethods[methodNameToApply] = 1;

                for (iterator = 0; iterator < paq.length; iterator++) {
                    if (paq[iterator] && paq[iterator][0]) {
                        var methodName = paq[iterator][0];

                        if (methodNameToApply === methodName) {
                            apply(paq[iterator]);
                            delete paq[iterator];

                            if (appliedMethods[methodName] > 1
                                && methodName !== "addTracker"
                                && methodName !== "enableLinkTracking") {
                                logConsoleError('The method ' + methodName + ' is registered more than once in "_paq" variable. Only the last call has an effect. Please have a look at the multiple Matomo trackers documentation: https://developer.matomo.org/guides/tracking-javascript-guide#multiple-piwik-trackers');
                            }

                            appliedMethods[methodName]++;
                        }
                    }
                }
            }

            return paq;
        }

        /************************************************************
         * Constructor
         ************************************************************/

        var applyFirst = ['addTracker', 'forgetCookieConsentGiven', 'requireCookieConsent','disableBrowserFeatureDetection', 'disableCookies', 'setTrackerUrl', 'setAPIUrl', 'enableCrossDomainLinking', 'setCrossDomainLinkingTimeout', 'setSessionCookieTimeout', 'setVisitorCookieTimeout', 'setCookieNamePrefix', 'setCookieSameSite', 'setSecureCookie', 'setCookiePath', 'setCookieDomain', 'setDomains', 'setUserId', 'setVisitorId', 'setSiteId', 'alwaysUseSendBeacon', 'disableAlwaysUseSendBeacon', 'enableLinkTracking', 'setCookieConsentGiven', 'requireConsent', 'setConsentGiven', 'disablePerformanceTracking', 'setPagePerformanceTiming', 'setExcludedQueryParams', 'setExcludedReferrers'];

        function createFirstTracker(matomoUrl, siteId)
        {
            var tracker = new Tracker(matomoUrl, siteId);
            asyncTrackers.push(tracker);

            _paq = applyMethodsInOrder(_paq, applyFirst);

            // apply the queue of actions
            for (iterator = 0; iterator < _paq.length; iterator++) {
                if (_paq[iterator]) {
                    apply(_paq[iterator]);
                }
            }

            // replace initialization array with proxy object
            _paq = new TrackerProxy();

            Matomo.trigger('TrackerAdded', [tracker]);

            return tracker;
        }

        /************************************************************
         * Proxy object
         * - this allows the caller to continue push()'ing to _paq
         *   after the Tracker has been initialized and loaded
         ************************************************************/

        // initialize the Matomo singleton
        addEventListener(windowAlias, 'beforeunload', beforeUnloadHandler, false);
        addEventListener(windowAlias, 'visibilitychange', function () {
            // if unloaded, return
            if (isPageUnloading) {
                return;
            }
            // if not visible
            if (documentAlias.visibilityState === 'hidden') {
                executePluginMethod('unload');
            }
        }, false);
        addEventListener(windowAlias, 'online', function () {
            if (isDefined(navigatorAlias.serviceWorker)) {
                navigatorAlias.serviceWorker.ready.then(function(swRegistration) {
                    if (swRegistration && swRegistration.sync) {
                        return swRegistration.sync.register('matomoSync');
                    }
                }, function() {
                    // handle (but ignore) failed promise, see https://github.com/matomo-org/matomo/issues/17454
                });
            }
        }, false);

        addEventListener(windowAlias,'message', function(e) {
            if (!e || !e.origin) {
                return;
            }

            var tracker, i, matomoHost;
            var originHost = getHostName(e.origin);

            var trackers = Matomo.getAsyncTrackers();
            for (i = 0; i < trackers.length; i++) {
                matomoHost = getHostName(trackers[i].getMatomoUrl());

                // find the matching tracker
                if (matomoHost === originHost) {
                    tracker = trackers[i];
                    break;
                }
            }

            if (!tracker) {
                // no matching tracker
                // Don't accept the message unless it came from the expected origin
                return;
            }

            var data = null;
            try {
                data = JSON.parse(e.data);
            } catch (ex) {
                return;
            }

            if (!data) {
                return;
            }

            function postMessageToCorrectFrame(postMessage){
                // Find the iframe with the right URL to send it back to
                var iframes = documentAlias.getElementsByTagName('iframe');
                for (i = 0; i < iframes.length; i++) {
                    var iframe = iframes[i];
                    var iframeHost = getHostName(iframe.src);

                    if (iframe.contentWindow && isDefined(iframe.contentWindow.postMessage) && iframeHost === originHost) {
                        var jsonMessage = JSON.stringify(postMessage);
                        iframe.contentWindow.postMessage(jsonMessage, '*');
                    }
                }
            }

            // This listener can process two kinds of messages
            // 1) maq_initial_value => sent by optout iframe when it finishes loading.  Passes the value of the third
            // party opt-out cookie (if set) - we need to use this and any first-party cookies that are present to
            // initialise the configHasConsent value and send back the result so that the display can be updated.
            // 2) maq_opted_in => sent by optout iframe when the user changes their optout setting.  We need to update
            // our first-party cookie.
            if (isDefined(data.maq_initial_value)) {
                // Make a message to tell the optout iframe about the current state

                postMessageToCorrectFrame({
                    maq_opted_in: data.maq_initial_value && tracker.hasConsent(),
                    maq_url: tracker.getMatomoUrl(),
                    maq_optout_by_default: tracker.isConsentRequired()
                });
            } else if (isDefined(data.maq_opted_in)) {
                // perform the opt in or opt out...
                trackers = Matomo.getAsyncTrackers();
                for (i = 0; i < trackers.length; i++) {
                    tracker = trackers[i];
                    if (data.maq_opted_in) {
                        tracker.rememberConsentGiven();
                    } else {
                        tracker.forgetConsentGiven();
                    }
                }

                // Make a message to tell the optout iframe about the current state
                postMessageToCorrectFrame({
                    maq_confirm_opted_in: tracker.hasConsent(),
                    maq_url: tracker.getMatomoUrl(),
                    maq_optout_by_default: tracker.isConsentRequired()
                });
            }
        }, false);

        Date.prototype.getTimeAlias = Date.prototype.getTime;

        /************************************************************
         * Public data and methods
         ************************************************************/

        Matomo = {
            initialized: false,

            JSON: windowAlias.JSON,

            /**
             * DOM Document related methods
             */
            DOM: {
                /**
                 * Adds an event listener to the given element.
                 * @param element
                 * @param eventType
                 * @param eventHandler
                 * @param useCapture  Optional
                 */
                addEventListener: function (element, eventType, eventHandler, useCapture) {
                    var captureType = typeof useCapture;
                    if (captureType === 'undefined') {
                        useCapture = false;
                    }

                    addEventListener(element, eventType, eventHandler, useCapture);
                },
                /**
                 * Specify a function to execute when the DOM is fully loaded.
                 *
                 * If the DOM is already loaded, the function will be executed immediately.
                 *
                 * @param function callback
                 */
                onLoad: trackCallbackOnLoad,

                /**
                 * Specify a function to execute when the DOM is ready.
                 *
                 * If the DOM is already ready, the function will be executed immediately.
                 *
                 * @param function callback
                 */
                onReady: trackCallbackOnReady,

                /**
                 * Detect whether a node is visible right now.
                 */
                isNodeVisible: isVisible,

                /**
                 * Detect whether a node has been visible at some point
                 */
                isOrWasNodeVisible: content.isNodeVisible
            },

            /**
             * Listen to an event and invoke the handler when a the event is triggered.
             *
             * @param string event
             * @param function handler
             */
            on: function (event, handler) {
                if (!eventHandlers[event]) {
                    eventHandlers[event] = [];
                }

                eventHandlers[event].push(handler);
            },

            /**
             * Remove a handler to no longer listen to the event. Must pass the same handler that was used when
             * attaching the event via ".on".
             * @param string event
             * @param function handler
             */
            off: function (event, handler) {
                if (!eventHandlers[event]) {
                    return;
                }

                var i = 0;
                for (i; i < eventHandlers[event].length; i++) {
                    if (eventHandlers[event][i] === handler) {
                        eventHandlers[event].splice(i, 1);
                    }
                }
            },

            /**
             * Triggers the given event and passes the parameters to all handlers.
             *
             * @param string event
             * @param Array extraParameters
             * @param Object context  If given the handler will be executed in this context
             */
            trigger: function (event, extraParameters, context) {
                if (!eventHandlers[event]) {
                    return;
                }

                var i = 0;
                for (i; i < eventHandlers[event].length; i++) {
                    eventHandlers[event][i].apply(context || windowAlias, extraParameters);
                }
            },

            /**
             * Add plugin
             *
             * @param string pluginName
             * @param Object pluginObj
             */
            addPlugin: function (pluginName, pluginObj) {
                plugins[pluginName] = pluginObj;
            },

            /**
             * Get Tracker (factory method)
             *
             * @param string matomoUrl
             * @param int|string siteId
             * @return Tracker
             */
            getTracker: function (matomoUrl, siteId) {
                if (!isDefined(siteId)) {
                    siteId = this.getAsyncTracker().getSiteId();
                }
                if (!isDefined(matomoUrl)) {
                    matomoUrl = this.getAsyncTracker().getTrackerUrl();
                }

                return new Tracker(matomoUrl, siteId);
            },

            /**
             * Get all created async trackers
             *
             * @return Tracker[]
             */
            getAsyncTrackers: function () {
                return asyncTrackers;
            },

            /**
             * Adds a new tracker. All sent requests will be also sent to the given siteId and matomoUrl.
             * If matomoUrl is not set, current url will be used.
             *
             * @param null|string matomoUrl  If null, will reuse the same tracker URL of the current tracker instance
             * @param int|string siteId
             * @return Tracker
             */
            addTracker: function (matomoUrl, siteId) {
                var tracker;
                if (!asyncTrackers.length) {
                    tracker = createFirstTracker(matomoUrl, siteId);
                } else {
                    tracker = asyncTrackers[0].addTracker(matomoUrl, siteId);
                }
                return tracker;
            },

            /**
             * Get internal asynchronous tracker object.
             *
             * If no parameters are given, it returns the internal asynchronous tracker object. If a matomoUrl and idSite
             * is given, it will try to find an optional
             *
             * @param string matomoUrl
             * @param int|string siteId
             * @return Tracker
             */
            getAsyncTracker: function (matomoUrl, siteId) {

                var firstTracker;
                if (asyncTrackers && asyncTrackers.length && asyncTrackers[0]) {
                    firstTracker = asyncTrackers[0];
                } else {
                    return createFirstTracker(matomoUrl, siteId);
                }

                if (!siteId && !matomoUrl) {
                    // for BC and by default we just return the initially created tracker
                    return firstTracker;
                }

                // we look for another tracker created via `addTracker` method
                if ((!isDefined(siteId) || null === siteId) && firstTracker) {
                    siteId = firstTracker.getSiteId();
                }

                if ((!isDefined(matomoUrl) || null === matomoUrl) && firstTracker) {
                    matomoUrl = firstTracker.getTrackerUrl();
                }

                var tracker, i = 0;
                for (i; i < asyncTrackers.length; i++) {
                    tracker = asyncTrackers[i];
                    if (tracker
                        && String(tracker.getSiteId()) === String(siteId)
                        && tracker.getTrackerUrl() === matomoUrl) {

                        return tracker;
                    }
                }
            },

            /**
             * When calling plugin methods via "_paq.push(['...'])" and the plugin is loaded separately because
             * matomo.js is not writable then there is a chance that first matomo.js is loaded and later the plugin.
             * In this case we would have already executed all "_paq.push" methods and they would not have succeeded
             * because the plugin will be loaded only later. In this case, once a plugin is loaded, it should call
             * "Matomo.retryMissedPluginCalls()" so they will be executed after all.
             */
            retryMissedPluginCalls: function () {
                var missedCalls = missedPluginTrackerCalls;
                missedPluginTrackerCalls = [];
                var i = 0;
                for (i; i < missedCalls.length; i++) {
                    apply(missedCalls[i]);
                }
            }

    };

        // Expose Matomo as an AMD module
        if (typeof define === 'function' && define.amd) {
            define('piwik', [], function () { return Matomo; });
            define('matomo', [], function () { return Matomo; });
        }

        return Matomo;
    }());
}

/*!! pluginTrackerHook */

(function () {
    'use strict';

    function hasPaqConfiguration()
    {
        if ('object' !== typeof _paq) {
            return false;
        }
        // needed to write it this way for jslint
        var lengthType = typeof _paq.length;
        if ('undefined' === lengthType) {
            return false;
        }

        return !!_paq.length;
    }

    if (window
        && 'object' === typeof window.matomoPluginAsyncInit
        && window.matomoPluginAsyncInit.length) {
        var i = 0;
        for (i; i < window.matomoPluginAsyncInit.length; i++) {
            if (typeof window.matomoPluginAsyncInit[i] === 'function') {
                window.matomoPluginAsyncInit[i]();
            }
        }
    }

    if (window && window.piwikAsyncInit) {
        window.piwikAsyncInit();
    }

    if (window && window.matomoAsyncInit) {
        window.matomoAsyncInit();
    }

    if (!window.Matomo.getAsyncTrackers().length) {
        // we only create an initial tracker when no other async tracker has been created yet in matomoAsyncInit()
        if (hasPaqConfiguration()) {
            // we only create an initial tracker if there is a configuration for it via _paq. Otherwise
            // Matomo.getAsyncTrackers() would return unconfigured trackers
            window.Matomo.addTracker();
        } else {
            _paq = {push: function (args) {
                    // needed to write it this way for jslint
                    var consoleType = typeof console;
                    if (consoleType !== 'undefined' && console && console.error) {
                        console.error('_paq.push() was used but Matomo tracker was not initialized before the matomo.js file was loaded. Make sure to configure the tracker via _paq.push before loading matomo.js. Alternatively, you can create a tracker via Matomo.addTracker() manually and then use _paq.push but it may not fully work as tracker methods may not be executed in the correct order.', args);
                    }
                }};
        }
    }

    window.Matomo.trigger('MatomoInitialized', []);
    window.Matomo.initialized = true;
}());


/*jslint sloppy: true */
(function () {
    var jsTrackerType = (typeof window.AnalyticsTracker);
    if (jsTrackerType === 'undefined') {
        window.AnalyticsTracker = window.Matomo;
    }
}());
/*jslint sloppy: false */

/************************************************************
 * Deprecated functionality below
 * Legacy piwik.js compatibility ftw
 ************************************************************/

/*
 * Matomo globals
 *
 *   var piwik_install_tracker, piwik_tracker_pause, piwik_download_extensions, piwik_hosts_alias, piwik_ignore_classes;
 */
/*global piwik_log:true */
/*global piwik_track:true */

/**
 * Track page visit
 *
 * @param string documentTitle
 * @param int|string siteId
 * @param string matomoUrl
 * @param mixed customData
 */
if (typeof window.piwik_log !== 'function') {
    window.piwik_log = function (documentTitle, siteId, matomoUrl, customData) {
        'use strict';

        function getOption(optionName) {
            try {
                if (window['piwik_' + optionName]) {
                    return window['piwik_' + optionName];
                }
            } catch (ignore) { }

            return; // undefined
        }

        // instantiate the tracker
        var option,
            matomoTracker = window.Matomo.getTracker(matomoUrl, siteId);

        // initialize tracker
        matomoTracker.setDocumentTitle(documentTitle);
        matomoTracker.setCustomData(customData);

        // handle Matomo globals
        option = getOption('tracker_pause');

        if (option) {
            matomoTracker.setLinkTrackingTimer(option);
        }

        option = getOption('download_extensions');

        if (option) {
            matomoTracker.setDownloadExtensions(option);
        }

        option = getOption('hosts_alias');

        if (option) {
            matomoTracker.setDomains(option);
        }

        option = getOption('ignore_classes');

        if (option) {
            matomoTracker.setIgnoreClasses(option);
        }

        // track this page view
        matomoTracker.trackPageView();

        // default is to install the link tracker
        if (getOption('install_tracker')) {

            /**
             * Track click manually (function is defined below)
             *
             * @param string sourceUrl
             * @param int|string siteId
             * @param string matomoUrl
             * @param string linkType
             */
            piwik_track = function (sourceUrl, siteId, matomoUrl, linkType) {
                matomoTracker.setSiteId(siteId);
                matomoTracker.setTrackerUrl(matomoUrl);
                matomoTracker.trackLink(sourceUrl, linkType);
            };

            // set-up link tracking
            matomoTracker.enableLinkTracking();
        }
    };
}

/*! @license-end */