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All Rights Reserved. * * Licensed under the W3C SOFTWARE AND DOCUMENT NOTICE AND LICENSE. * * https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document * */ (function() { 'use strict'; // Exit early if we're not running in a browser. if (typeof window !== 'object') { return; } // Exit early if all IntersectionObserver and IntersectionObserverEntry // features are natively supported. if ('IntersectionObserver' in window && 'IntersectionObserverEntry' in window && 'intersectionRatio' in window.IntersectionObserverEntry.prototype) { // Minimal polyfill for Edge 15's lack of `isIntersecting` // See: https://github.com/w3c/IntersectionObserver/issues/211 if (!('isIntersecting' in window.IntersectionObserverEntry.prototype)) { Object.defineProperty(window.IntersectionObserverEntry.prototype, 'isIntersecting', { get: function () { return this.intersectionRatio > 0; } }); } return; } /** * Returns the embedding frame element, if any. * @param {!Document} doc * @return {!Element} */ function getFrameElement(doc) { try { return doc.defaultView && doc.defaultView.frameElement || null; } catch (e) { // Ignore the error. return null; } } /** * A local reference to the root document. */ var document = (function(startDoc) { var doc = startDoc; var frame = getFrameElement(doc); while (frame) { doc = frame.ownerDocument; frame = getFrameElement(doc); } return doc; })(window.document); /** * An IntersectionObserver registry. This registry exists to hold a strong * reference to IntersectionObserver instances currently observing a target * element. Without this registry, instances without another reference may be * garbage collected. */ var registry = []; /** * The signal updater for cross-origin intersection. When not null, it means * that the polyfill is configured to work in a cross-origin mode. * @type {function(DOMRect|ClientRect, DOMRect|ClientRect)} */ var crossOriginUpdater = null; /** * The current cross-origin intersection. Only used in the cross-origin mode. * @type {DOMRect|ClientRect} */ var crossOriginRect = null; /** * Creates the global IntersectionObserverEntry constructor. * https://w3c.github.io/IntersectionObserver/#intersection-observer-entry * @param {Object} entry A dictionary of instance properties. * @constructor */ function IntersectionObserverEntry(entry) { this.time = entry.time; this.target = entry.target; this.rootBounds = ensureDOMRect(entry.rootBounds); this.boundingClientRect = ensureDOMRect(entry.boundingClientRect); this.intersectionRect = ensureDOMRect(entry.intersectionRect || getEmptyRect()); this.isIntersecting = !!entry.intersectionRect; // Calculates the intersection ratio. var targetRect = this.boundingClientRect; var targetArea = targetRect.width * targetRect.height; var intersectionRect = this.intersectionRect; var intersectionArea = intersectionRect.width * intersectionRect.height; // Sets intersection ratio. if (targetArea) { // Round the intersection ratio to avoid floating point math issues: // https://github.com/w3c/IntersectionObserver/issues/324 this.intersectionRatio = Number((intersectionArea / targetArea).toFixed(4)); } else { // If area is zero and is intersecting, sets to 1, otherwise to 0 this.intersectionRatio = this.isIntersecting ? 1 : 0; } } /** * Creates the global IntersectionObserver constructor. * https://w3c.github.io/IntersectionObserver/#intersection-observer-interface * @param {Function} callback The function to be invoked after intersection * changes have queued. The function is not invoked if the queue has * been emptied by calling the `takeRecords` method. * @param {Object=} opt_options Optional configuration options. * @constructor */ function IntersectionObserver(callback, opt_options) { var options = opt_options || {}; if (typeof callback != 'function') { throw new Error('callback must be a function'); } if ( options.root && options.root.nodeType != 1 && options.root.nodeType != 9 ) { throw new Error('root must be a Document or Element'); } // Binds and throttles `this._checkForIntersections`. this._checkForIntersections = throttle( this._checkForIntersections.bind(this), this.THROTTLE_TIMEOUT); // Private properties. this._callback = callback; this._observationTargets = []; this._queuedEntries = []; this._rootMarginValues = this._parseRootMargin(options.rootMargin); // Public properties. this.thresholds = this._initThresholds(options.threshold); this.root = options.root || null; this.rootMargin = this._rootMarginValues.map(function(margin) { return margin.value + margin.unit; }).join(' '); /** @private @const {!Array<!Document>} */ this._monitoringDocuments = []; /** @private @const {!Array<function()>} */ this._monitoringUnsubscribes = []; } /** * The minimum interval within which the document will be checked for * intersection changes. */ IntersectionObserver.prototype.THROTTLE_TIMEOUT = 100; /** * The frequency in which the polyfill polls for intersection changes. * this can be updated on a per instance basis and must be set prior to * calling `observe` on the first target. */ IntersectionObserver.prototype.POLL_INTERVAL = null; /** * Use a mutation observer on the root element * to detect intersection changes. */ IntersectionObserver.prototype.USE_MUTATION_OBSERVER = true; /** * Sets up the polyfill in the cross-origin mode. The result is the * updater function that accepts two arguments: `boundingClientRect` and * `intersectionRect` - just as these fields would be available to the * parent via `IntersectionObserverEntry`. This function should be called * each time the iframe receives intersection information from the parent * window, e.g. via messaging. * @return {function(DOMRect|ClientRect, DOMRect|ClientRect)} */ IntersectionObserver._setupCrossOriginUpdater = function() { if (!crossOriginUpdater) { /** * @param {DOMRect|ClientRect} boundingClientRect * @param {DOMRect|ClientRect} intersectionRect */ crossOriginUpdater = function(boundingClientRect, intersectionRect) { if (!boundingClientRect || !intersectionRect) { crossOriginRect = getEmptyRect(); } else { crossOriginRect = convertFromParentRect(boundingClientRect, intersectionRect); } registry.forEach(function(observer) { observer._checkForIntersections(); }); }; } return crossOriginUpdater; }; /** * Resets the cross-origin mode. */ IntersectionObserver._resetCrossOriginUpdater = function() { crossOriginUpdater = null; crossOriginRect = null; }; /** * Starts observing a target element for intersection changes based on * the thresholds values. * @param {Element} target The DOM element to observe. */ IntersectionObserver.prototype.observe = function(target) { var isTargetAlreadyObserved = this._observationTargets.some(function(item) { return item.element == target; }); if (isTargetAlreadyObserved) { return; } if (!(target && target.nodeType == 1)) { throw new Error('target must be an Element'); } this._registerInstance(); this._observationTargets.push({element: target, entry: null}); this._monitorIntersections(target.ownerDocument); this._checkForIntersections(); }; /** * Stops observing a target element for intersection changes. * @param {Element} target The DOM element to observe. */ IntersectionObserver.prototype.unobserve = function(target) { this._observationTargets = this._observationTargets.filter(function(item) { return item.element != target; }); this._unmonitorIntersections(target.ownerDocument); if (this._observationTargets.length == 0) { this._unregisterInstance(); } }; /** * Stops observing all target elements for intersection changes. */ IntersectionObserver.prototype.disconnect = function() { this._observationTargets = []; this._unmonitorAllIntersections(); this._unregisterInstance(); }; /** * Returns any queue entries that have not yet been reported to the * callback and clears the queue. This can be used in conjunction with the * callback to obtain the absolute most up-to-date intersection information. * @return {Array} The currently queued entries. */ IntersectionObserver.prototype.takeRecords = function() { var records = this._queuedEntries.slice(); this._queuedEntries = []; return records; }; /** * Accepts the threshold value from the user configuration object and * returns a sorted array of unique threshold values. If a value is not * between 0 and 1 and error is thrown. * @private * @param {Array|number=} opt_threshold An optional threshold value or * a list of threshold values, defaulting to [0]. * @return {Array} A sorted list of unique and valid threshold values. */ IntersectionObserver.prototype._initThresholds = function(opt_threshold) { var threshold = opt_threshold || [0]; if (!Array.isArray(threshold)) threshold = [threshold]; return threshold.sort().filter(function(t, i, a) { if (typeof t != 'number' || isNaN(t) || t < 0 || t > 1) { throw new Error('threshold must be a number between 0 and 1 inclusively'); } return t !== a[i - 1]; }); }; /** * Accepts the rootMargin value from the user configuration object * and returns an array of the four margin values as an object containing * the value and unit properties. If any of the values are not properly * formatted or use a unit other than px or %, and error is thrown. * @private * @param {string=} opt_rootMargin An optional rootMargin value, * defaulting to '0px'. * @return {Array<Object>} An array of margin objects with the keys * value and unit. */ IntersectionObserver.prototype._parseRootMargin = function(opt_rootMargin) { var marginString = opt_rootMargin || '0px'; var margins = marginString.split(/\s+/).map(function(margin) { var parts = /^(-?\d*\.?\d+)(px|%)$/.exec(margin); if (!parts) { throw new Error('rootMargin must be specified in pixels or percent'); } return {value: parseFloat(parts[1]), unit: parts[2]}; }); // Handles shorthand. margins[1] = margins[1] || margins[0]; margins[2] = margins[2] || margins[0]; margins[3] = margins[3] || margins[1]; return margins; }; /** * Starts polling for intersection changes if the polling is not already * happening, and if the page's visibility state is visible. * @param {!Document} doc * @private */ IntersectionObserver.prototype._monitorIntersections = function(doc) { var win = doc.defaultView; if (!win) { // Already destroyed. return; } if (this._monitoringDocuments.indexOf(doc) != -1) { // Already monitoring. return; } // Private state for monitoring. var callback = this._checkForIntersections; var monitoringInterval = null; var domObserver = null; // If a poll interval is set, use polling instead of listening to // resize and scroll events or DOM mutations. if (this.POLL_INTERVAL) { monitoringInterval = win.setInterval(callback, this.POLL_INTERVAL); } else { addEvent(win, 'resize', callback, true); addEvent(doc, 'scroll', callback, true); if (this.USE_MUTATION_OBSERVER && 'MutationObserver' in win) { domObserver = new win.MutationObserver(callback); domObserver.observe(doc, { attributes: true, childList: true, characterData: true, subtree: true }); } } this._monitoringDocuments.push(doc); this._monitoringUnsubscribes.push(function() { // Get the window object again. When a friendly iframe is destroyed, it // will be null. var win = doc.defaultView; if (win) { if (monitoringInterval) { win.clearInterval(monitoringInterval); } removeEvent(win, 'resize', callback, true); } removeEvent(doc, 'scroll', callback, true); if (domObserver) { domObserver.disconnect(); } }); // Also monitor the parent. var rootDoc = (this.root && (this.root.ownerDocument || this.root)) || document; if (doc != rootDoc) { var frame = getFrameElement(doc); if (frame) { this._monitorIntersections(frame.ownerDocument); } } }; /** * Stops polling for intersection changes. * @param {!Document} doc * @private */ IntersectionObserver.prototype._unmonitorIntersections = function(doc) { var index = this._monitoringDocuments.indexOf(doc); if (index == -1) { return; } var rootDoc = (this.root && (this.root.ownerDocument || this.root)) || document; // Check if any dependent targets are still remaining. var hasDependentTargets = this._observationTargets.some(function(item) { var itemDoc = item.element.ownerDocument; // Target is in this context. if (itemDoc == doc) { return true; } // Target is nested in this context. while (itemDoc && itemDoc != rootDoc) { var frame = getFrameElement(itemDoc); itemDoc = frame && frame.ownerDocument; if (itemDoc == doc) { return true; } } return false; }); if (hasDependentTargets) { return; } // Unsubscribe. var unsubscribe = this._monitoringUnsubscribes[index]; this._monitoringDocuments.splice(index, 1); this._monitoringUnsubscribes.splice(index, 1); unsubscribe(); // Also unmonitor the parent. if (doc != rootDoc) { var frame = getFrameElement(doc); if (frame) { this._unmonitorIntersections(frame.ownerDocument); } } }; /** * Stops polling for intersection changes. * @param {!Document} doc * @private */ IntersectionObserver.prototype._unmonitorAllIntersections = function() { var unsubscribes = this._monitoringUnsubscribes.slice(0); this._monitoringDocuments.length = 0; this._monitoringUnsubscribes.length = 0; for (var i = 0; i < unsubscribes.length; i++) { unsubscribes[i](); } }; /** * Scans each observation target for intersection changes and adds them * to the internal entries queue. If new entries are found, it * schedules the callback to be invoked. * @private */ IntersectionObserver.prototype._checkForIntersections = function() { if (!this.root && crossOriginUpdater && !crossOriginRect) { // Cross origin monitoring, but no initial data available yet. return; } var rootIsInDom = this._rootIsInDom(); var rootRect = rootIsInDom ? this._getRootRect() : getEmptyRect(); this._observationTargets.forEach(function(item) { var target = item.element; var targetRect = getBoundingClientRect(target); var rootContainsTarget = this._rootContainsTarget(target); var oldEntry = item.entry; var intersectionRect = rootIsInDom && rootContainsTarget && this._computeTargetAndRootIntersection(target, targetRect, rootRect); var rootBounds = null; if (!this._rootContainsTarget(target)) { rootBounds = getEmptyRect(); } else if (!crossOriginUpdater || this.root) { rootBounds = rootRect; } var newEntry = item.entry = new IntersectionObserverEntry({ time: now(), target: target, boundingClientRect: targetRect, rootBounds: rootBounds, intersectionRect: intersectionRect }); if (!oldEntry) { this._queuedEntries.push(newEntry); } else if (rootIsInDom && rootContainsTarget) { // If the new entry intersection ratio has crossed any of the // thresholds, add a new entry. if (this._hasCrossedThreshold(oldEntry, newEntry)) { this._queuedEntries.push(newEntry); } } else { // If the root is not in the DOM or target is not contained within // root but the previous entry for this target had an intersection, // add a new record indicating removal. if (oldEntry && oldEntry.isIntersecting) { this._queuedEntries.push(newEntry); } } }, this); if (this._queuedEntries.length) { this._callback(this.takeRecords(), this); } }; /** * Accepts a target and root rect computes the intersection between then * following the algorithm in the spec. * TODO(philipwalton): at this time clip-path is not considered. * https://w3c.github.io/IntersectionObserver/#calculate-intersection-rect-algo * @param {Element} target The target DOM element * @param {Object} targetRect The bounding rect of the target. * @param {Object} rootRect The bounding rect of the root after being * expanded by the rootMargin value. * @return {?Object} The final intersection rect object or undefined if no * intersection is found. * @private */ IntersectionObserver.prototype._computeTargetAndRootIntersection = function(target, targetRect, rootRect) { // If the element isn't displayed, an intersection can't happen. if (window.getComputedStyle(target).display == 'none') return; var intersectionRect = targetRect; var parent = getParentNode(target); var atRoot = false; while (!atRoot && parent) { var parentRect = null; var parentComputedStyle = parent.nodeType == 1 ? window.getComputedStyle(parent) : {}; // If the parent isn't displayed, an intersection can't happen. if (parentComputedStyle.display == 'none') return null; if (parent == this.root || parent.nodeType == /* DOCUMENT */ 9) { atRoot = true; if (parent == this.root || parent == document) { if (crossOriginUpdater && !this.root) { if (!crossOriginRect || crossOriginRect.width == 0 && crossOriginRect.height == 0) { // A 0-size cross-origin intersection means no-intersection. parent = null; parentRect = null; intersectionRect = null; } else { parentRect = crossOriginRect; } } else { parentRect = rootRect; } } else { // Check if there's a frame that can be navigated to. var frame = getParentNode(parent); var frameRect = frame && getBoundingClientRect(frame); var frameIntersect = frame && this._computeTargetAndRootIntersection(frame, frameRect, rootRect); if (frameRect && frameIntersect) { parent = frame; parentRect = convertFromParentRect(frameRect, frameIntersect); } else { parent = null; intersectionRect = null; } } } else { // If the element has a non-visible overflow, and it's not the <body> // or <html> element, update the intersection rect. // Note: <body> and <html> cannot be clipped to a rect that's not also // the document rect, so no need to compute a new intersection. var doc = parent.ownerDocument; if (parent != doc.body && parent != doc.documentElement && parentComputedStyle.overflow != 'visible') { parentRect = getBoundingClientRect(parent); } } // If either of the above conditionals set a new parentRect, // calculate new intersection data. if (parentRect) { intersectionRect = computeRectIntersection(parentRect, intersectionRect); } if (!intersectionRect) break; parent = parent && getParentNode(parent); } return intersectionRect; }; /** * Returns the root rect after being expanded by the rootMargin value. * @return {ClientRect} The expanded root rect. * @private */ IntersectionObserver.prototype._getRootRect = function() { var rootRect; if (this.root && !isDoc(this.root)) { rootRect = getBoundingClientRect(this.root); } else { // Use <html>/<body> instead of window since scroll bars affect size. var doc = isDoc(this.root) ? this.root : document; var html = doc.documentElement; var body = doc.body; rootRect = { top: 0, left: 0, right: html.clientWidth || body.clientWidth, width: html.clientWidth || body.clientWidth, bottom: html.clientHeight || body.clientHeight, height: html.clientHeight || body.clientHeight }; } return this._expandRectByRootMargin(rootRect); }; /** * Accepts a rect and expands it by the rootMargin value. * @param {DOMRect|ClientRect} rect The rect object to expand. * @return {ClientRect} The expanded rect. * @private */ IntersectionObserver.prototype._expandRectByRootMargin = function(rect) { var margins = this._rootMarginValues.map(function(margin, i) { return margin.unit == 'px' ? margin.value : margin.value * (i % 2 ? rect.width : rect.height) / 100; }); var newRect = { top: rect.top - margins[0], right: rect.right + margins[1], bottom: rect.bottom + margins[2], left: rect.left - margins[3] }; newRect.width = newRect.right - newRect.left; newRect.height = newRect.bottom - newRect.top; return newRect; }; /** * Accepts an old and new entry and returns true if at least one of the * threshold values has been crossed. * @param {?IntersectionObserverEntry} oldEntry The previous entry for a * particular target element or null if no previous entry exists. * @param {IntersectionObserverEntry} newEntry The current entry for a * particular target element. * @return {boolean} Returns true if a any threshold has been crossed. * @private */ IntersectionObserver.prototype._hasCrossedThreshold = function(oldEntry, newEntry) { // To make comparing easier, an entry that has a ratio of 0 // but does not actually intersect is given a value of -1 var oldRatio = oldEntry && oldEntry.isIntersecting ? oldEntry.intersectionRatio || 0 : -1; var newRatio = newEntry.isIntersecting ? newEntry.intersectionRatio || 0 : -1; // Ignore unchanged ratios if (oldRatio === newRatio) return; for (var i = 0; i < this.thresholds.length; i++) { var threshold = this.thresholds[i]; // Return true if an entry matches a threshold or if the new ratio // and the old ratio are on the opposite sides of a threshold. if (threshold == oldRatio || threshold == newRatio || threshold < oldRatio !== threshold < newRatio) { return true; } } }; /** * Returns whether or not the root element is an element and is in the DOM. * @return {boolean} True if the root element is an element and is in the DOM. * @private */ IntersectionObserver.prototype._rootIsInDom = function() { return !this.root || containsDeep(document, this.root); }; /** * Returns whether or not the target element is a child of root. * @param {Element} target The target element to check. * @return {boolean} True if the target element is a child of root. * @private */ IntersectionObserver.prototype._rootContainsTarget = function(target) { var rootDoc = (this.root && (this.root.ownerDocument || this.root)) || document; return ( containsDeep(rootDoc, target) && (!this.root || rootDoc == target.ownerDocument) ); }; /** * Adds the instance to the global IntersectionObserver registry if it isn't * already present. * @private */ IntersectionObserver.prototype._registerInstance = function() { if (registry.indexOf(this) < 0) { registry.push(this); } }; /** * Removes the instance from the global IntersectionObserver registry. * @private */ IntersectionObserver.prototype._unregisterInstance = function() { var index = registry.indexOf(this); if (index != -1) registry.splice(index, 1); }; /** * Returns the result of the performance.now() method or null in browsers * that don't support the API. * @return {number} The elapsed time since the page was requested. */ function now() { return window.performance && performance.now && performance.now(); } /** * Throttles a function and delays its execution, so it's only called at most * once within a given time period. * @param {Function} fn The function to throttle. * @param {number} timeout The amount of time that must pass before the * function can be called again. * @return {Function} The throttled function. */ function throttle(fn, timeout) { var timer = null; return function () { if (!timer) { timer = setTimeout(function() { fn(); timer = null; }, timeout); } }; } /** * Adds an event handler to a DOM node ensuring cross-browser compatibility. * @param {Node} node The DOM node to add the event handler to. * @param {string} event The event name. * @param {Function} fn The event handler to add. * @param {boolean} opt_useCapture Optionally adds the even to the capture * phase. Note: this only works in modern browsers. */ function addEvent(node, event, fn, opt_useCapture) { if (typeof node.addEventListener == 'function') { node.addEventListener(event, fn, opt_useCapture || false); } else if (typeof node.attachEvent == 'function') { node.attachEvent('on' + event, fn); } } /** * Removes a previously added event handler from a DOM node. * @param {Node} node The DOM node to remove the event handler from. * @param {string} event The event name. * @param {Function} fn The event handler to remove. * @param {boolean} opt_useCapture If the event handler was added with this * flag set to true, it should be set to true here in order to remove it. */ function removeEvent(node, event, fn, opt_useCapture) { if (typeof node.removeEventListener == 'function') { node.removeEventListener(event, fn, opt_useCapture || false); } else if (typeof node.detatchEvent == 'function') { node.detatchEvent('on' + event, fn); } } /** * Returns the intersection between two rect objects. * @param {Object} rect1 The first rect. * @param {Object} rect2 The second rect. * @return {?Object|?ClientRect} The intersection rect or undefined if no * intersection is found. */ function computeRectIntersection(rect1, rect2) { var top = Math.max(rect1.top, rect2.top); var bottom = Math.min(rect1.bottom, rect2.bottom); var left = Math.max(rect1.left, rect2.left); var right = Math.min(rect1.right, rect2.right); var width = right - left; var height = bottom - top; return (width >= 0 && height >= 0) && { top: top, bottom: bottom, left: left, right: right, width: width, height: height } || null; } /** * Shims the native getBoundingClientRect for compatibility with older IE. * @param {Element} el The element whose bounding rect to get. * @return {DOMRect|ClientRect} The (possibly shimmed) rect of the element. */ function getBoundingClientRect(el) { var rect; try { rect = el.getBoundingClientRect(); } catch (err) { // Ignore Windows 7 IE11 "Unspecified error" // https://github.com/w3c/IntersectionObserver/pull/205 } if (!rect) return getEmptyRect(); // Older IE if (!(rect.width && rect.height)) { rect = { top: rect.top, right: rect.right, bottom: rect.bottom, left: rect.left, width: rect.right - rect.left, height: rect.bottom - rect.top }; } return rect; } /** * Returns an empty rect object. An empty rect is returned when an element * is not in the DOM. * @return {ClientRect} The empty rect. */ function getEmptyRect() { return { top: 0, bottom: 0, left: 0, right: 0, width: 0, height: 0 }; } /** * Ensure that the result has all of the necessary fields of the DOMRect. * Specifically this ensures that `x` and `y` fields are set. * * @param {?DOMRect|?ClientRect} rect * @return {?DOMRect} */ function ensureDOMRect(rect) { // A `DOMRect` object has `x` and `y` fields. if (!rect || 'x' in rect) { return rect; } // A IE's `ClientRect` type does not have `x` and `y`. The same is the case // for internally calculated Rect objects. For the purposes of // `IntersectionObserver`, it's sufficient to simply mirror `left` and `top` // for these fields. return { top: rect.top, y: rect.top, bottom: rect.bottom, left: rect.left, x: rect.left, right: rect.right, width: rect.width, height: rect.height }; } /** * Inverts the intersection and bounding rect from the parent (frame) BCR to * the local BCR space. * @param {DOMRect|ClientRect} parentBoundingRect The parent's bound client rect. * @param {DOMRect|ClientRect} parentIntersectionRect The parent's own intersection rect. * @return {ClientRect} The local root bounding rect for the parent's children. */ function convertFromParentRect(parentBoundingRect, parentIntersectionRect) { var top = parentIntersectionRect.top - parentBoundingRect.top; var left = parentIntersectionRect.left - parentBoundingRect.left; return { top: top, left: left, height: parentIntersectionRect.height, width: parentIntersectionRect.width, bottom: top + parentIntersectionRect.height, right: left + parentIntersectionRect.width }; } /** * Checks to see if a parent element contains a child element (including inside * shadow DOM). * @param {Node} parent The parent element. * @param {Node} child The child element. * @return {boolean} True if the parent node contains the child node. */ function containsDeep(parent, child) { var node = child; while (node) { if (node == parent) return true; node = getParentNode(node); } return false; } /** * Gets the parent node of an element or its host element if the parent node * is a shadow root. * @param {Node} node The node whose parent to get. * @return {Node|null} The parent node or null if no parent exists. */ function getParentNode(node) { var parent = node.parentNode; if (node.nodeType == /* DOCUMENT */ 9 && node != document) { // If this node is a document node, look for the embedding frame. return getFrameElement(node); } // If the parent has element that is assigned through shadow root slot if (parent && parent.assignedSlot) { parent = parent.assignedSlot.parentNode } if (parent && parent.nodeType == 11 && parent.host) { // If the parent is a shadow root, return the host element. return parent.host; } return parent; } /** * Returns true if `node` is a Document. * @param {!Node} node * @returns {boolean} */ function isDoc(node) { return node && node.nodeType === 9; } // Exposes the constructors globally. window.IntersectionObserver = IntersectionObserver; window.IntersectionObserverEntry = IntersectionObserverEntry; }()); window.performance.mark('apstagLoadEnd'); window.performance.measure('apstagLoad', 'apstagLoadStart', 'apstagLoadEnd'); var timing = window.performance.getEntriesByName('apstagLoad')[0].duration; window.dataLayer.push({ event: 'apstagLoad', page: page, timing: timing }); /**----------------- Initialize apstag (A9) -----------------*/ function apstagInitAndFetch() { apstag.init({ pubID: "3067", adServer: "googletag", bidTimeout: 1000 }); window.dataLayer.push({ event: "initialA9RequestInitiated", timing: generateFormattedTime(), sessionId: sessionId }); apstag.fetchBids( { slots: apstagSlots, timeout: 1000 // Make sure this timeout is less than or equal to OpenWrap TimeOut }, function(bids) { googletag.cmd.push(function() { apstag.setDisplayBids(); PWT.a9_Bids = bids; PWT.a9_BidsReceived = true; initAdserver(false); }); } ); } /**-------------------------- Mup Fpb integration --------------------------*/ var MAGIC = 0xbeefcafe; function getMupFpbParams(mupFpbSlotConfigs, mupFpbConfig) { var mupParams = {}; mupFpbSlotConfigs.forEach(function(slotConfig) { try { mupParams[slotConfig.placement] = { site: mupFpbConfig.site, geo: mupFpbConfig.adlerGeo || "", platform: mupFpbConfig.detectedDevice, sizes: slotConfig.sizes, position: slotConfig.targeting.pos }; } catch (error) { console.log("Error forming mup params:", error.message); return false; } return true; }); return mupParams; } function getAdlerKey(size) { var keyMap = { "970x250": "adler_a", "300x600": "adler_a", "320x100": "adler_a", "970x90": "adler_b", "728x90": "adler", "300x250": "adler", "320x50": "adler", "160x600": "adler" }; return keyMap[size]; } function parseMupResponse(mupFpbAjaxCall) { try { window.adlerData.mup.values = JSON.parse(mupFpbAjaxCall.responseText); initAdserver(false); } catch (err) { console.log("Error parsing mupResponse: ".concat(err.message)); } } function processMupFpbValues(adUnitsArray) { if (!window.adlerData.mup.values) return false; var mupFpbValues = window.adlerData.mup.values; adUnitsArray.forEach(function(adUnit) { if (adUnit.bidData.kvp.pwtsz) { try { var adlerKey = getAdlerKey(adUnit.bidData.kvp.pwtsz); if ( adlerKey === null || !mupFpbValues[adUnit.code] || !mupFpbValues[adUnit.code][adlerKey] ) { return false; } var markup = mupFpbValues[adUnit.code][adlerKey]; var deobfuscatedMarkup = deobMup(markup.adler); var muv = 100 + deobfuscatedMarkup; var centPwtecp = parseInt( adUnit.bidData.kvp.pwtecp.replace(".", ""), 10 ); var adjustedPwtecp = (centPwtecp * muv) / 10000; adUnit.bidData.kvp.pwtecp = adjustedPwtecp.toFixed(2); adUnit.bidData.kvp.mup = "".concat(deobfuscatedMarkup); } catch (error) { console.log("Error applying mup for:", adUnit.code); return false; } } return true; }); window.adlerData.mup.processed = true; return true; } function callMupFpb(slotConfigs, mupFpbConfig) { var mupFpbReq = new XMLHttpRequest(); mupFpbReq.addEventListener( "load", parseMupResponse.bind(null, mupFpbReq) ); mupFpbReq.open("POST", mupFpbConfig.mupFpbApiEndpoint, true); mupFpbReq.timeout = 1000; mupFpbReq.send( JSON.stringify(getMupFpbParams(slotConfigs, mupFpbConfig)) ); } function reverse(n) { var x = new Uint32Array(1); x[0] = n; x[0] = ((x[0] & 0x0000ffff) << 16) | ((x[0] & 0xffff0000) >>> 16); x[0] = ((x[0] & 0x55555555) << 1) | ((x[0] & 0xaaaaaaaa) >>> 1); x[0] = ((x[0] & 0x33333333) << 2) | ((x[0] & 0xcccccccc) >>> 2); x[0] = ((x[0] & 0x0f0f0f0f) << 4) | ((x[0] & 0xf0f0f0f0) >>> 4); x[0] = ((x[0] & 0x00ff00ff) << 8) | ((x[0] & 0xff00ff00) >>> 8); return x[0]; } function unflip(n) { return reverse(n ^ MAGIC); } function deobMup(encryptedMup) { if (!encryptedMup) { throw new Error( "Missing Mup. Please confirm value is being passed in." ); } var decryptedMup = unflip(parseInt(encryptedMup, 10)); return decryptedMup; } /**-------------- End of Mup Fpb integration --------------*/ /**--------------------- Rtf integration ------------------*/ function setRtfInstrumentationKV(rtfSlotConfigs, status, error) { rtfSlotConfigs.forEach(function(slotConfig) { slotConfig.targeting.adler_status = status; if (error) { slotConfig.targeting.adler_error = error; } }); } function getRtfParams(rtfSlotConfigs, rtfFpbConfig) { var requestParams = {}; var geo = rtfFpbConfig.adlerGeo || ""; if (geo === "") { setRtfInstrumentationKV(rtfSlotConfigs, "nogeo", "nogeo"); } rtfSlotConfigs.forEach(function(slotConfig) { try { requestParams[slotConfig.placement] = { site: rtfFpbConfig.site, geo: geo, platform: rtfFpbConfig.detectedDevice, sizes: slotConfig.sizes, position: slotConfig.targeting.pos }; } catch (error) { console.log("Error forming rtf params:", error.message); return false; } return true; }); return requestParams; } function rtfFallback(rtfSlotConfigs, event) { setRtfInstrumentationKV(rtfSlotConfigs, event.type); } function injectRtfValue(adUnit, rtfSlotConfigs) { var rtfFpbValues = window.adlerData.rtf.values; rtfSlotConfigs.forEach(function(slotConfig) { if (slotConfig.placement !== adUnit.code) return false; if (!rtfFpbValues[slotConfig.placement]) { slotConfig.targeting.adler_status = "nofloor"; } else { slotConfig.targeting.adler = rtfFpbValues[slotConfig.placement].adler; slotConfig.targeting.adler_a = rtfFpbValues[slotConfig.placement].adler_a; slotConfig.targeting.adler_b = rtfFpbValues[slotConfig.placement].adler_b; slotConfig.targeting.adler_status = "ok"; } return true; }); } function parseRtfValues(rtfAjaxCall, rtfSlotConfigs) { try { window.adlerData.rtf.values = JSON.parse(rtfAjaxCall.responseText); initAdserver(false); } catch (err) { setRtfInstrumentationKV(rtfSlotConfigs, "parse", err.message); } } function processRtfFpbValues( pubmaticAdUnitsArray, a9BidsArray, rtfSlotConfigs, shouldSetLoki ) { if (!window.adlerData.rtf.values) return false; var rtfFpbValues = window.adlerData.rtf.values; var a9NoBidValues = ["0", "1", "2"]; for (var i = 0; i < pubmaticAdUnitsArray.length; i += 1) { var adUnit = pubmaticAdUnitsArray[i]; var noA9bidForSlot = false; for (var j = 0; j < a9BidsArray.length; j += 1) { var a9Bid = a9BidsArray[j]; if ( a9Bid.slotID === pubmaticAdUnitsArray[i].code && (!a9Bid.amznbid || a9NoBidValues.indexOf(a9Bid.amznbid) !== -1) ) { noA9bidForSlot = true; break; } } if ( !adUnit.bidData.kvp.pwtsz && (noA9bidForSlot || a9BidsArray.length === 0) && shouldSetLoki ) { try { if (!rtfFpbValues[adUnit.code]) { return false; } var rtfValue = rtfFpbValues[adUnit.code].adler_a || rtfFpbValues[adUnit.code].adler; adUnit.bidData.kvp.pwtpid = "loki"; adUnit.bidData.kvp.pwtecp = rtfValue; adUnit.bidData.kvp.pwtbst = "1"; injectRtfValue(adUnit, rtfSlotConfigs); } catch (error) { console.log("Error applying rtf for:", adUnit.code); } } } window.adlerData.rtf.processed = true; return true; } function callRTFFpb(slotConfigs, rtfFpbConfig) { var rtfReq = new XMLHttpRequest(); rtfReq.addEventListener( "load", parseRtfValues.bind(null, rtfReq, slotConfigs) ); rtfReq.addEventListener("timeout", rtfFallback.bind(null, slotConfigs)); rtfReq.addEventListener("error", rtfFallback.bind(null, slotConfigs)); rtfReq.open("POST", rtfFpbConfig.rtfFpbApiEndpoint, true); rtfReq.timeout = 1000; rtfReq.send(JSON.stringify(getRtfParams(slotConfigs, rtfFpbConfig))); } /**------------------ End of Rtf integration ------------------*/ googletag.cmd.push(function() { callMupFpb(allSlotConfigs, mupFpbConfiguration); callRTFFpb(allSlotConfigs, rtfFpbConfig); }); var testAdParam = {}; var mupData = undefined; var updatePageTargeting = function(pageTargeting, testParam) { pageTargeting.spe = 'n'; pageTargeting.kw = ''; pageTargeting.loc = mupFpbConfiguration && mupFpbConfiguration.adlerGeo ? mupFpbConfiguration.adlerGeo : ''; pageTargeting.rpv = Math.floor(Math.random() * 100 + 1).toString(); pageTargeting.evince = 'ad'; pageTargeting.ref = 'organic'; pageTargeting.lang = window.navigator.userLanguage || window.navigator.language; pageTargeting.dow = new Date().getDay().toString(); pageTargeting.pv = typeof SCCookie !== "undefined" ? SCCookie.getPageViewCount() + "" : ""; if (mupData) { pageTargeting.mup = mupData.profileNumber; } window.adlerData.shouldSetLoki = pageTargeting.rpv > bidRpvThreshold; const objs = [pageTargeting, testParam]; const targeting = objs.reduce(function(r, o) { Object.keys(o).forEach(function(key) { r[key] = o[key]; }); return r; }); return targeting; } function refreshAds(event) { var refreshSlotConfigs = event.detail.slotConfigs.concat(event.detail.lazySlotConfigs); var pageTargeting = updatePageTargeting(event.detail.pageTargeting, testAdParam); window.performance.mark('adStackStart'); (function refreshLazySlots(lazySlotConfigs) { window.refreshLazyAds = lazySlotConfigs.map(function(slot) { return { placement: slot.placement, refresh: true }; }); })(event.detail.lazySlotConfigs); // Clear old state window.initAdserverFlag = false; // Delete old config googletag.destroySlots(); callMupFpb(refreshSlotConfigs, mupFpbConfiguration); callRTFFpb(refreshSlotConfigs, rtfFpbConfig); determineConsent(); /**---------- Set page level targeting for DFP ----------*/ (function setPageLevelTargeting(googletag) { /* Both Bidders Set targeting params pertaining to all slots on page. */ googletag = googletag || window.googletag; Object.keys(pageTargeting).forEach(function(pageTarget) { if (Object.prototype.hasOwnProperty.call(pageTargeting, pageTarget)) { (function(key, value) { googletag.cmd.push(function() { googletag.pubads().setTargeting(key, value); }); })(pageTarget, pageTargeting[pageTarget]); } }); })(googletag); /**---------- Set ad slot level targeting for DFP ----------*/ if (typeof event.detail.slotConfigs === "object") { (function setSpecificAdSlotTargeting(googletag, specificSlotConfigs) { var refresh = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false; /* FPB 1. Define initial (static) slots for DPT. 2. Add listeners for events relevant to analytics. 3. Set targeting params pertaining to individual slots. */ var adSlotRenderPeriods = {}; googletag = googletag || window.googletag; specificSlotConfigs.forEach(function(slot) { googletag.cmd.push(function() { adSlots.slots[slot.placement] = googletag.defineSlot(slot.code, slot.sizes, slot.placement).addService(googletag.pubads()); googletag.pubads().addEventListener('slotRenderEnded', function(event) { if (event.slot === adSlots.slots[slot.placement]) { adSlotRenderPeriods[slot.placement] = Date.now(); } }); googletag.pubads().addEventListener('slotOnload', function(event) { if (event.slot === adSlots.slots[slot.placement]) { window.dataLayer.push({ event: 'gptSlotRenderPeriod', page: page, slotId: slot.placement, code: slot.code, position: slot.targeting.pos, position2: slot.targeting.pos2, time: Date.now() - adSlotRenderPeriods[slot.placement] }); } }); googletag.pubads().addEventListener('impressionViewable', function(event) { if (event.slot === adSlots.slots[slot.placement]) { window.dataLayer.push({ event: 'gptImpressionViewable', page: page, slotId: slot.placement, code: slot.code, position: slot.targeting.pos, position2: slot.targeting.pos2 }); } }); Object.keys(slot.targeting).forEach(function(target) { if (Object.prototype.hasOwnProperty.call(slot.targeting, target)) { adSlots.slots[slot.placement].setTargeting(target, slot.targeting[target]); } }); adSlots.slots[slot.placement].setTargeting('adrefresh', refresh ? 'y' : 'n'); }); }); })(googletag, event.detail.slotConfigs, event.detail.isNotPageTransition); } (function pushAdSlots(googletag) { googletag = googletag || window.googletag; googletag.cmd.push(function() { googletag.pubads().enableSingleRequest(); googletag.pubads().disableInitialLoad(); googletag.enableServices(); window.dfpReady = true; }); })(googletag); googletag.display(); PWT.requestBidSlots = googletag.pubads().getSlots(); if (typeof PWT.requestBids === 'function') { const config = PWT.generateConfForGPT(PWT.requestBidSlots); PWT.requestBids( config, function(adUnitsArray) { PWT.ow_Bids = adUnitsArray; PWT.ow_BidsReceived = true; initAdserver(false); } ); } apstag.fetchBids({ slots: apstagSlots, timeout: 1000 // Make sure this timeout is less than or equal to OpenWrap TimeOut }, function(bids) { googletag.cmd.push(function() { apstag.setDisplayBids(); PWT.a9_Bids = bids; PWT.a9_BidsReceived = true; initAdserver(false); }); }); } function requestLazyAd(event) { var results = {}; var lazyInitAdserver = function(slot) { if (results.a9_BidsReceived && results.ow_BidsReceived && window.adlerData.mup.values && window.adlerData.rtf.values) { if (!results.ow_Bids) { var owBackup = []; for (var i = 0; i < slotConfigs.length; i++) { owBackup.push({ adUnitIndex: '' + i, adUnitId: slotConfigs[i].code, bidData: { kvp: {} }, code: slotConfigs[i].placement, divId: slotConfigs[i].placement, }); } results.ow_Bids = owBackup; } if (!results.a9_Bids) { results.a9_Bids = []; } processMupFpbValues(results.ow_Bids); processRtfFpbValues(results.ow_Bids, results.a9_Bids, allSlotConfigs, window.adlerData.shouldSetLoki); PWT.addKeyValuePairsToGPTSlots(results.ow_Bids); googletag.display(slotConfig.placement); googletag.pubads().refresh([slot]); } } var slotConfig = lazySlotConfigs.find( (function(config) { return config.placement === event.detail; }) ); if (slotConfig && googletag) { var apstagSlot = (function formatApstagSlot(slot) { var slots = [{ slotID: slot.placement, sizes: 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0-8.836-7.164-16-16-16m-4.367 23.646h-3.431v-10.316h3.431v10.316m-1.716-11.726h-.022c-1.151 0-1.895-.793-1.895-1.783 0-1.012.768-1.783 1.939-1.783 1.174 0 1.896.771 1.918 1.783 0 .99-.744 1.783-1.94 1.783m14.08 11.726h-3.43v-5.52c0-1.387-.496-2.333-1.738-2.333-.946 0-1.512.64-1.76 1.255-.091.221-.113.525-.113.836v5.762h-3.429c0 0 .044-9.349 0-10.316h3.429v1.461c.457-.705 1.271-1.703 3.092-1.703 2.256 0 3.949 1.473 3.949 4.642v5.916"/></g></svg></i></a></li> </ul></div> <h2 class="hwg"><span class="hw" data-headword-id="diphthong">diphthong</span></h2><div class="hwg"><div class="entryGroup" id="h70188112646880"><h3 class="pronunciations">Pronunciation <a class="ipaLink" href="/web/20210413175646/https://www.lexico.com/grammar/key-to-pronunciation" title="Key to pronunciations"></a><span class="phoneticspelling">/ˈdɪfθɒŋ/</span> <a class="speaker" onclick="this.firstElementChild.play();"><audio src="https://web.archive.org/web/20210413175646im_/https://lex-audio.useremarkable.com/mp3/diphthong_gb_1.mp3" preload="none"></audio></a><span class="phoneticspelling">/ˈdɪpθɒŋ/</span> </h3></div></div><a data-behaviour="ga-event-synonyms" data-value="view synonyms" href="https://web.archive.org/web/20210413175646/https://www.thesaurus.com/browse/diphthong">See synonyms for <em>diphthong</em> on Thesaurus.com</a><p class="associatedTranslation">Translate <a href="/web/20210413175646/https://www.lexico.com/en-es/translate/diphthong">diphthong</a> into Spanish</p></header></div><section class="gramb"><h3 class="ps pos"><span class="pos">noun</span></h3><span class="transitivity"></span><ul class="semb"><li><div class="trg"><p><span class="iteration">1</span><span class="ind">A sound formed by the combination of two vowels in a single syllable, in which the sound begins as one vowel and moves towards another (as in coin, loud, and side).</span><div class="crossReference">Often contrasted with <a href="/web/20210413175646/https://www.lexico.com/definition/monophthong">monophthong</a>, <a href="/web/20210413175646/https://www.lexico.com/definition/triphthong">triphthong</a></div></p><span class="indicators"></span><div class="exg"><div class="ex"><em>‘The language has a musical quality and employs a great number of diphthongs and other vowel combinations.’</em></div></div><div class="examples"><div class="moreInfo"><button data-behaviour="ga-event" data-value="more example sentences">More example sentences</button></div><div class="exg"><ul class="english-ex"><li class="ex"><em>‘Density is thus largely a function of word stock and reflects at this stage in Coolidge's work an affinity for monosyllabic words, particularly those that couple long vowels or diphthongs with consonant blends.’</em></li><li class="ex"><em>‘Most Modern English vowels are diphthongs, so obeying the ‘one sound, one letter’ rule demands either pairing of vowel letters or replacing all our current vowel sounds with the fewer pure sounds, as in Italian and Spanish.’</em></li><li class="ex"><em>‘Similarly, a study of Tunisian women in Morocco showed that older women categorically use diphthongs /aw/and/aj /, while middle-aged women alternate between diphthongs and monophthongs.’</em></li><li class="ex"><em>‘Like U.S. Spanish, early Spanish exhibited a strong tendency to form diphthongs from contiguous vowels.’</em></li><li class="ex"><em>‘Few novice teachers addressed vowel r words, more difficult vowel team words such as those with diphthongs having more than one sound, or two-syllable words.’</em></li><li class="ex"><em>‘For these speakers, the diphthong in fife starts out near the vowel of bud, and ends near the vowel of bade; while the diphthong in five starts near the vowel of hod, and ends nears the vowel of hed.’</em></li><li class="ex"><em>‘In most contemporary dialects, it's a diphthong with a high front off-glide, so you might take it as mixed on the hot-or-not dimension, but ‘a front vowel sound’ it is definitely not.’</em></li><li class="ex"><em>‘Our role model was our head teacher, Miss Osborne, known as the High Mistress, who flapped about the place in her gown and lapsed into classical Greek pronunciation whenever she used a diphthong.’</em></li><li class="ex"><em>‘People in that part of Bolivia have a lot of Quechua and Aymara words in their vocabulary, and ones with final falling-sonority diphthongs are pretty typical.’</em></li><li class="ex"><em>‘The diphthongs au and ai are pronounced like those in ‘cow’ and ‘sky,’ respectively.’</em></li><li class="ex"><em>‘The diphthongs ayyy and eeee turn up again and again, long vowels lengthened by slow consonants around them.’</em></li><li class="ex"><em>‘This was adopted into English and subjected to the normal sound-changes of the late medieval and early modern period: the final - e ceased to be pronounced and the long i became a diphthong.’</em></li><li class="ex"><em>‘Pupils were asked to read a range of sentences and words, but what we were looking at was the merger of the diphthongs in the words near and square.’</em></li><li class="ex"><em>‘All Australian accents are regional, and the elongated diphthong, particularly the ‘ooo’, is the immediate giveaway for New South Welshpersons.’</em></li><li class="ex"><em>‘The formation of diphthongs from contiguous vowels represents a common prohibition in languages against starting a syllable with a vowel, as opposed to a consonant.’</em></li></ul></div></div><ol class="subSenses"><li class="subSense"><span class="subsenseIteration">1.1</span><span class="ind">A digraph representing the sound of a diphthong or single vowel (as in feat).</span><div class="trg"></div><div class="exg"><div class="ex"><em>‘The Pali alphabet used for written Burmese is made up of eight vowels, three diphthongs, 32 consonants, and several tones.’</em></div></div><div class="examples"><div class="moreInfo"><button data-behaviour="ga-event" data-value="more example sentences">More example sentences</button></div><div class="exg"><ul class="english-ex"><li class="ex"><em>‘However, all subsequent authors except Meek have used the diphthong, so Archaeocyathus is now treated as a justified emendation of Billings' original spelling.’</em></li></ul></div></div></li><li class="subSense"><span class="subsenseIteration">1.2</span><span class="ind">A compound vowel character; a ligature (such as æ).</span><div class="trg"></div></li></ol></div></li></ul></section><section class="etymology etym usage"><h3><strong>Usage</strong></h3><div class="senseInnerWrapper"><p>For a discussion of the pronunciation of diphthong, see <br><a href="/web/20210413175646/https://www.lexico.com/definition/diphtheria">diphtheria</a></p></div></section><section class="etymology etym"><h3><strong>Origin</strong></h3><div class="senseInnerWrapper"><p>Late Middle English from French diphtongue, via late Latin from Greek diphthongos, from di- ‘twice’ + phthongos ‘voice, sound’.</p></div></section></div></div></div><aside class="sideBanner"><div class="sideBannerWrap"><div class="banner adUnit"><div id="lexi_serp_dkt_atf_160x600_1"></div><div id=""></div></div></div></aside><aside id="sidebar" class="sidebar extend"><div class="sidebar-content"><div class="banbox-mini ad-placeholder" id="top_right_rail"><div class="adUnit "><div id="lexi_serp_dkt_btf_300x250_20"><script>googletag.cmd.push(function() { googletag.display("lexi_serp_dkt_btf_300x250_20"); });</script></div><div id="lexi_serp_mweb_btf_300x250_10"><script>googletag.cmd.push(function() { googletag.display("lexi_serp_mweb_btf_300x250_10"); });</script></div></div></div><div class="dayword"><section><div class="daywordmain"><span class="wotd-title">Word of the day</span><div class="word_spacer"></div><div><div><strong><a class="linkword" id="b9fe7f88-a061-4d72-866a-7c7cbc0ddba5" href="/web/20210413175646/https://www.lexico.com/definition/oojah" data-behaviour="ga-event-wotd" data-value="Word">oojah</a></strong><p class="word_type phonetic_spelling">/ ˈuːdʒɑː /</p><p class="word_type pos">noun</p></div></div><div class="cta"><a id="b9fe7f88-a061-4d72-866a-7c7cbc0ddba5" href="/web/20210413175646/https://www.lexico.com/definition/oojah" data-behaviour="ga-event-wotd" data-value="Word">See definitions & examples</a></div></div></section></div><div class="news layout"><section><a href="/web/20210413175646/https://www.lexico.com/explore/word-of-the-year" data-behaviour="ga-event" data-value="Sidebar - story 1"><div class="box-img" data-ratiox="2.35" data-ratioy="1"><img alt="202012 semicolon lexico woty english 748x482" data-src="https://web.archive.org/web/20210413175646/https://raw.githubusercontent.com/entropyhub/entropyhub.github.io/master/assets/images/reexternalwotypage/202012_semicolon_lexico_WOTY_english_748x482.jpg" class="lazy" src="data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs="/></div><article><span class="article-title">It's here! Lexico's first Word of the Year!</span></article></a></section><section><a href="/web/20210413175646/https://www.lexico.com/explore/does-english-have-most-words" data-behaviour="ga-event" data-value="Sidebar - story 2"><div class="box-img" data-ratiox="2.35" data-ratioy="1"><img alt="Language questions min" data-src="https://web.archive.org/web/20210413175646/https://s3.amazonaws.com/lexico.useremarkable.com/production/images/uploads/7321/medium/language-questions-min.jpg" class="lazy" src="data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs="/></div><article><span class="article-title">Does English Have More Words Than Any Other Language?</span></article></a></section></div><div class="quiz-panel-odo"><div class="quiz-panel" id="quiz_92"><div class="quizTitle">Matching verbs to collective nouns</div><form class="simple_form new_quiz_response" id="new_quiz_response" action="/web/20210413175646/https://www.lexico.com/quiz_responses" accept-charset="UTF-8" data-remote="true" method="post"><input name="utf8" type="hidden" value="✓"/><input type="hidden" name="quiz_id" id="quiz_id" value="92"/><div class="questions"><div class="question first current"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5666" value="5666"/><label class="option_text" for="quiz_option_id_5666">The government is committed to education reform.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5667" value="5667"/><label class="option_text" for="quiz_option_id_5667">The government are committed to education reform. </label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5694" value="5694"/><label class="option_text" for="quiz_option_id_5694">More people are shopping online.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5695" value="5695"/><label class="option_text" for="quiz_option_id_5695">More people is shopping online.</label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5683" value="5683"/><label class="option_text" for="quiz_option_id_5683">The herd are out in the field.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5682" value="5682"/><label class="option_text" for="quiz_option_id_5682">The herd is out in the field.</label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5665" value="5665"/><label class="option_text" for="quiz_option_id_5665">The novice crew hope to beat the record.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5664" value="5664"/><label class="option_text" for="quiz_option_id_5664">The novice crew hopes to beat the record.</label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5684" value="5684"/><label class="option_text" for="quiz_option_id_5684">The gang have escaped. </label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5685" value="5685"/><label class="option_text" for="quiz_option_id_5685">The gang has escaped. </label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5689" value="5689"/><label class="option_text" for="quiz_option_id_5689">The crew are made up of experienced sailors.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5688" value="5688"/><label class="option_text" for="quiz_option_id_5688">The crew is made up of experienced sailors.</label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5712" value="5712"/><label class="option_text" for="quiz_option_id_5712">The interview panel comprises three women.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5713" value="5713"/><label class="option_text" for="quiz_option_id_5713">The interview panel comprise three women.</label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5660" value="5660"/><label class="option_text" for="quiz_option_id_5660">The committee has reached a decision.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5661" value="5661"/><label class="option_text" for="quiz_option_id_5661">The committee have reached a decision.</label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5706" value="5706"/><label class="option_text" for="quiz_option_id_5706">The pride of lions are at home in the savannah. </label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5707" value="5707"/><label class="option_text" for="quiz_option_id_5707">The pride of lions is at home in the savannah. </label></li></ul></div><div class="question"><p class="question-text">Which of these sentences is correct?</p><ul class="options"><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5702" value="5702"/><label class="option_text" for="quiz_option_id_5702">Every team have to consist of three players.</label></li><li class="radio question_option" data-behaviour="ga-event-quiz" data-value="clicks"><input type="radio" name="quiz_option_id" id="quiz_option_id_5703" value="5703"/><label class="option_text" for="quiz_option_id_5703">Every team has to consist of three players.</label></li></ul></div><div class="question last"><h3 class="score-message">You scored <span class="final-score"></span>/10 practise again?</h3><button class="retry-quiz">Retry</button></div></div></form><button name="button" type="button" data-behaviour="ga-event-quiz" data-value="next question" class="next-question" html="{:disabled=>"disabled"}">Next</button><div class="score-counter"><span class="current-score">0</span>/10</div></div><br/></div><div class="trending-panel-odo sideTrendWrap"><div class="trend" lang="en"><section class="boxSizing"><span class="trend-title-wrapper"><span class="trend-title">Trending Words</span></span><div class="popular"><p><span>Most popular in the world</span></p></div><ol class="words_section"><li><a data-behaviour="ga-event-trending-words" data-value="word 1" href="/web/20210413175646/https://www.lexico.com/definition/hogarthian">Hogarthian</a></li><li><a data-behaviour="ga-event-trending-words" data-value="word 2" href="/web/20210413175646/https://www.lexico.com/definition/filmy">filmy</a></li><li><a data-behaviour="ga-event-trending-words" data-value="word 3" href="/web/20210413175646/https://www.lexico.com/definition/vedette">vedette</a></li><li><a data-behaviour="ga-event-trending-words" data-value="word 4" href="/web/20210413175646/https://www.lexico.com/definition/kissy">kissy</a></li><li><a data-behaviour="ga-event-trending-words" data-value="word 5" href="/web/20210413175646/https://www.lexico.com/definition/text_message">text message</a></li></ol></section></div></div></div></aside></div></div></div><div class="violbox h-box lex"><div class="container full"><div class="further_reading" id="further_reading_section"><span>Are You Learning English? 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