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/*! instant.page v5.1.0 - (C) 2019-2020 Alexandre Dieulot - https://instant.page/license */ ( function (){ let mouseoverTimer let lastTouchTimestamp const prefetches = new Set() const prefetchElement = document.createElement( 'link' ) const isSupported = prefetchElement.relList && prefetchElement.relList.supports && prefetchElement.relList.supports( 'prefetch' ) && window.IntersectionObserver && 'isIntersecting' in IntersectionObserverEntry.prototype const allowQueryString = 'instantAllowQueryString' in document.body.dataset const allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset const useWhitelist = 'instantWhitelist' in document.body.dataset const mousedownShortcut = 'instantMousedownShortcut' in document.body.dataset const DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION = 1111 let delayOnHover = 65 let useMousedown = false let useMousedownOnly = false let useViewport = false if ('instantIntensity' in document.body.dataset) { const intensity = document.body.dataset.instantIntensity if (intensity.substr( 0, 'mousedown'.length ) == 'mousedown') { useMousedown = true if (intensity == 'mousedown-only') { useMousedownOnly = true } } else if (intensity.substr( 0, 'viewport'.length ) == 'viewport') { if (! ( navigator.connection && ( navigator.connection.saveData || ( navigator.connection.effectiveType && navigator.connection.effectiveType.includes( '2g' ) ) ) )) { if (intensity == "viewport") { /* Biggest iPhone resolution (which we want): 414 × 896 = 370944 * Small 7" tablet resolution (which we don’t want): 600 × 1024 = 614400 * Note that the viewport (which we check here) is smaller than the resolution due to the UI’s chrome */ if (document.documentElement.clientWidth * document.documentElement.clientHeight < 450000) { useViewport = true } } else if (intensity == "viewport-all") { useViewport = true } } } else { const milliseconds = parseInt( intensity ) if (! isNaN( milliseconds )) { delayOnHover = milliseconds } } } if (isSupported) { const eventListenersOptions = { capture: true, passive: true, } if (! useMousedownOnly) { document.addEventListener( 'touchstart', touchstartListener, eventListenersOptions ) } if (! useMousedown) { document.addEventListener( 'mouseover', mouseoverListener, eventListenersOptions ) } else if (! mousedownShortcut) { document.addEventListener( 'mousedown', mousedownListener, eventListenersOptions ) } if (mousedownShortcut) { document.addEventListener( 'mousedown', mousedownShortcutListener, eventListenersOptions ) } if (useViewport) { let triggeringFunction if (window.requestIdleCallback) { triggeringFunction = ( callback ) => { requestIdleCallback( callback, { timeout: 1500, } ) } } else { triggeringFunction = ( callback ) => { callback() } } triggeringFunction( () => { const intersectionObserver = new IntersectionObserver( ( entries ) => { entries.forEach( ( entry ) => { if (entry.isIntersecting) { const linkElement = entry.target intersectionObserver.unobserve( linkElement ) preload( linkElement.href ) } } ) } ) document.querySelectorAll( 'a' ).forEach( ( linkElement ) => { if (isPreloadable( linkElement )) { intersectionObserver.observe( linkElement ) } } ) } ) } } function touchstartListener( event ) { /* Chrome on Android calls mouseover before touchcancel so `lastTouchTimestamp` * must be assigned on touchstart to be measured on mouseover. */ lastTouchTimestamp = performance.now() const linkElement = event.target.closest( 'a' ) if (! isPreloadable( linkElement )) { return } preload( linkElement.href ) } function mouseoverListener( event ) { if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) { return } const linkElement = event.target.closest( 'a' ) if (! isPreloadable( linkElement )) { return } linkElement.addEventListener( 'mouseout', mouseoutListener, { passive: true } ) mouseoverTimer = setTimeout( () => { preload( linkElement.href ) mouseoverTimer = undefined }, delayOnHover ) } function mousedownListener( event ) { const linkElement = event.target.closest( 'a' ) if (! isPreloadable( linkElement )) { return } preload( linkElement.href ) } function mouseoutListener( event ) { if (event.relatedTarget && event.target.closest( 'a' ) == event.relatedTarget.closest( 'a' )) { return } if (mouseoverTimer) { clearTimeout( mouseoverTimer ) mouseoverTimer = undefined } } function mousedownShortcutListener( event ) { if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) { return } const linkElement = event.target.closest( 'a' ) if (event.which > 1 || event.metaKey || event.ctrlKey) { return } if (! linkElement) { return } linkElement.addEventListener( 'click', function( event ) { if (event.detail == 1337) { return } event.preventDefault() }, { capture: true, passive: false, once: true } ) const customEvent = new MouseEvent( 'click', { view: window, bubbles: true, cancelable: false, detail: 1337 } ) linkElement.dispatchEvent( customEvent ) } function isPreloadable( linkElement ) { if (! linkElement || ! linkElement.href) { return } if (useWhitelist && ! ( 'instant' in linkElement.dataset )) { return } if (! allowExternalLinks && linkElement.origin != location.origin && ! ( 'instant' in linkElement.dataset )) { return } if (! [ 'http:', 'https:' ].includes( linkElement.protocol )) { return } if (linkElement.protocol == 'http:' && location.protocol == 'https:') { return } if (! allowQueryString && linkElement.search && ! ( 'instant' in linkElement.dataset )) { return } if (linkElement.hash && linkElement.pathname + linkElement.search == location.pathname + location.search) { return } if ('noInstant' in linkElement.dataset) { return } return true } function preload( url ) { if (prefetches.has( url )) { return } const prefetcher = document.createElement( 'link' ) prefetcher.rel = 'prefetch' prefetcher.href = url document.head.appendChild( prefetcher ) prefetches.add( url ) } })();
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