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instant.page v5.2.0 - (C) 2019-2023 Alexandre Dieulot - https://instant.page/license */\n\nlet _chromiumMajorVersionInUserAgent = null\n  , _allowQueryString\n  , _allowExternalLinks\n  , _useWhitelist\n  , _delayOnHover = 65\n  , _lastTouchTimestamp\n  , _mouseoverTimer\n  , _preloadedList = new Set()\n\nconst DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION = 1111\n\ninit()\n\nfunction init() {\n  const isSupported = document.createElement('link').relList.supports('prefetch')\n  // instant.page is meant to be loaded with \u003cscript type=module\u003e\n  // (though sometimes webmasters load it as a regular script).\n  // So it’s normally executed (and must not cause JavaScript errors) in:\n  // - Chromium 61+\n  // - Gecko in Firefox 60+\n  // - WebKit in Safari 10.1+ (iOS 10.3+, macOS 10.10+)\n  //\n  // The check above used to check for IntersectionObserverEntry.isIntersecting\n  // but module scripts support implies this compatibility — except in Safari\n  // 10.1–12.0, but this prefetch check takes care of it.\n\n  if (!isSupported) {\n    return\n  }\n\n  const handleVaryAcceptHeader = 'instantVaryAccept' in document.body.dataset || 'Shopify' in window\n  // The `Vary: Accept` header when received in Chromium 79–109 makes prefetches\n  // unusable, as Chromium used to send a different `Accept` header.\n  // It’s applied on all Shopify sites by default, as Shopify is very popular\n  // and is the main source of this problem.\n  // `window.Shopify` only exists on “classic” Shopify sites. Those using\n  // Hydrogen (Remix SPA) aren’t concerned.\n\n  const chromiumUserAgentIndex = navigator.userAgent.indexOf('Chrome/')\n  if (chromiumUserAgentIndex \u003e -1) {\n    _chromiumMajorVersionInUserAgent = parseInt(navigator.userAgent.substring(chromiumUserAgentIndex + 'Chrome/'.length))\n  }\n  // The user agent client hints API is a theoretically more reliable way to\n  // get Chromium’s version… but it’s not available in Samsung Internet 20.\n  // It also requires a secure context, which would make debugging harder,\n  // and is only available in recent Chromium versions.\n  // In practice, Chromium browsers never shy from announcing \"Chrome\" in\n  // their regular user agent string, as that maximizes their compatibility.\n\n  if (handleVaryAcceptHeader \u0026\u0026 _chromiumMajorVersionInUserAgent \u0026\u0026 _chromiumMajorVersionInUserAgent \u003c 110) {\n    return\n  }\n\n  const mousedownShortcut = 'instantMousedownShortcut' in document.body.dataset\n  _allowQueryString = 'instantAllowQueryString' in document.body.dataset\n  _allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset\n  _useWhitelist = 'instantWhitelist' in document.body.dataset\n\n  const eventListenersOptions = {\n    capture: true,\n    passive: true,\n  }\n\n  let useMousedown = false\n  let useMousedownOnly = false\n  let useViewport = false\n  if ('instantIntensity' in document.body.dataset) {\n    const intensity = document.body.dataset.instantIntensity\n\n    if (intensity.startsWith('mousedown')) {\n      useMousedown = true\n      if (intensity == 'mousedown-only') {\n        useMousedownOnly = true\n      }\n    }\n    else if (intensity.startsWith('viewport')) {\n      const isNavigatorConnectionSaveDataEnabled = navigator.connection \u0026\u0026 navigator.connection.saveData\n      const isNavigatorConnectionLike2g = navigator.connection \u0026\u0026 navigator.connection.effectiveType \u0026\u0026 navigator.connection.effectiveType.includes('2g')\n      if (!isNavigatorConnectionSaveDataEnabled \u0026\u0026 !isNavigatorConnectionLike2g) {\n        if (intensity == \"viewport\") {\n          if (document.documentElement.clientWidth * document.documentElement.clientHeight \u003c 450000) {\n            useViewport = true\n            // Smartphones are the most likely to have a slow connection, and\n            // their small screen size limits the number of links (and thus\n            // server load).\n            //\n            // Foldable phones (being expensive as of 2023), tablets and PCs\n            // generally have a decent connection, and a big screen displaying\n            // more links that would put more load on the server.\n            //\n            // iPhone 14 Pro Max (want): 430×932 = 400 760\n            // Samsung Galaxy S22 Ultra with display size set to 80% (want):\n            // 450×965 = 434 250\n            // Small tablet (don’t want): 600×960 = 576 000\n            // Those number are virtual screen size, the viewport (used for\n            // the check above) will be smaller with the browser’s interface.\n          }\n        }\n        else if (intensity == \"viewport-all\") {\n          useViewport = true\n        }\n      }\n    }\n    else {\n      const milliseconds = parseInt(intensity)\n      if (!isNaN(milliseconds)) {\n        _delayOnHover = milliseconds\n      }\n    }\n  }\n\n  if (!useMousedownOnly) {\n    document.addEventListener('touchstart', touchstartListener, eventListenersOptions)\n  }\n\n  if (!useMousedown) {\n    document.addEventListener('mouseover', mouseoverListener, eventListenersOptions)\n  }\n  else if (!mousedownShortcut) {\n      document.addEventListener('mousedown', mousedownListener, eventListenersOptions)\n  }\n\n  if (mousedownShortcut) {\n    document.addEventListener('mousedown', mousedownShortcutListener, eventListenersOptions)\n  }\n\n  if (useViewport) {\n    let requestIdleCallbackOrFallback = window.requestIdleCallback\n    // Safari has no support as of 16.3: https://webkit.org/b/164193\n    if (!requestIdleCallbackOrFallback) {\n      requestIdleCallbackOrFallback = (callback) =\u003e {\n        callback()\n        // A smarter fallback like setTimeout is not used because devices that\n        // may eventually be eligible to a Safari version supporting prefetch\n        // will be very powerful.\n        // The weakest devices that could be eligible are the 2017 iPad and\n        // the 2016 MacBook.\n      }\n    }\n\n    requestIdleCallbackOrFallback(function observeIntersection() {\n      const intersectionObserver = new IntersectionObserver((entries) =\u003e {\n        entries.forEach((entry) =\u003e {\n          if (entry.isIntersecting) {\n            const anchorElement = entry.target\n            intersectionObserver.unobserve(anchorElement)\n            preload(anchorElement.href)\n          }\n        })\n      })\n\n      document.querySelectorAll('a').forEach((anchorElement) =\u003e {\n        if (isPreloadable(anchorElement)) {\n          intersectionObserver.observe(anchorElement)\n        }\n      })\n    }, {\n      timeout: 1500,\n    })\n  }\n}\n\nfunction touchstartListener(event) {\n  _lastTouchTimestamp = performance.now()\n  // Chrome on Android triggers mouseover before touchcancel, so\n  // `_lastTouchTimestamp` must be assigned on touchstart to be measured\n  // on mouseover.\n\n  const anchorElement = event.target.closest('a')\n\n  if (!isPreloadable(anchorElement)) {\n    return\n  }\n\n  preload(anchorElement.href, 'high')\n}\n\nfunction mouseoverListener(event) {\n  if (performance.now() - _lastTouchTimestamp \u003c DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {\n    return\n  }\n\n  if (!('closest' in event.target)) {\n    return\n    // Without this check sometimes an error “event.target.closest is not a function” is thrown, for unknown reasons\n    // That error denotes that `event.target` isn’t undefined. My best guess is that it’s the Document.\n    //\n    // Details could be gleaned from throwing such an error:\n    //throw new TypeError(`instant.page non-element event target: timeStamp=${~~event.timeStamp}, type=${event.type}, typeof=${typeof event.target}, nodeType=${event.target.nodeType}, nodeName=${event.target.nodeName}, viewport=${innerWidth}x${innerHeight}, coords=${event.clientX}x${event.clientY}, scroll=${scrollX}x${scrollY}`)\n  }\n  const anchorElement = event.target.closest('a')\n\n  if (!isPreloadable(anchorElement)) {\n    return\n  }\n\n  anchorElement.addEventListener('mouseout', mouseoutListener, {passive: true})\n\n  _mouseoverTimer = setTimeout(() =\u003e {\n    preload(anchorElement.href, 'high')\n    _mouseoverTimer = undefined\n  }, _delayOnHover)\n}\n\nfunction mousedownListener(event) {\n  const anchorElement = event.target.closest('a')\n\n  if (!isPreloadable(anchorElement)) {\n    return\n  }\n\n  preload(anchorElement.href, 'high')\n}\n\nfunction mouseoutListener(event) {\n  if (event.relatedTarget \u0026\u0026 event.target.closest('a') == event.relatedTarget.closest('a')) {\n    return\n  }\n\n  if (_mouseoverTimer) {\n    clearTimeout(_mouseoverTimer)\n    _mouseoverTimer = undefined\n  }\n}\n\nfunction mousedownShortcutListener(event) {\n  if (performance.now() - _lastTouchTimestamp \u003c DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {\n    return\n  }\n\n  const anchorElement = event.target.closest('a')\n\n  if (event.which \u003e 1 || event.metaKey || event.ctrlKey) {\n    return\n  }\n\n  if (!anchorElement) {\n    return\n  }\n\n  anchorElement.addEventListener('click', function (event) {\n    if (event.detail == 1337) {\n      return\n    }\n\n    event.preventDefault()\n  }, {capture: true, passive: false, once: true})\n\n  const customEvent = new MouseEvent('click', {view: window, bubbles: true, cancelable: false, detail: 1337})\n  anchorElement.dispatchEvent(customEvent)\n}\n\nfunction isPreloadable(anchorElement) {\n  if (!anchorElement || !anchorElement.href) {\n    return\n  }\n\n  if (_useWhitelist \u0026\u0026 !('instant' in anchorElement.dataset)) {\n    return\n  }\n\n  if (anchorElement.origin != location.origin) {\n    let allowed = _allowExternalLinks || 'instant' in anchorElement.dataset\n    if (!allowed || !_chromiumMajorVersionInUserAgent) {\n      // Chromium-only: see comment on “restrictive prefetch”\n      return\n    }\n  }\n\n  if (!['http:', 'https:'].includes(anchorElement.protocol)) {\n    return\n  }\n\n  if (anchorElement.protocol == 'http:' \u0026\u0026 location.protocol == 'https:') {\n    return\n  }\n\n  if (!_allowQueryString \u0026\u0026 anchorElement.search \u0026\u0026 !('instant' in anchorElement.dataset)) {\n    return\n  }\n\n  if (anchorElement.hash \u0026\u0026 anchorElement.pathname + anchorElement.search == location.pathname + location.search) {\n    return\n  }\n\n  if ('noInstant' in anchorElement.dataset) {\n    return\n  }\n\n  return true\n}\n\nfunction preload(url, fetchPriority = 'auto') {\n  if (_preloadedList.has(url)) {\n    return\n  }\n\n  const linkElement = document.createElement('link')\n  linkElement.rel = 'prefetch'\n  linkElement.href = url\n\n  linkElement.fetchPriority = fetchPriority\n  // By default, a prefetch is loaded with a low priority.\n  // When there’s a fair chance that this prefetch is going to be used in the\n  // near term (= after a touch/mouse event), giving it a high priority helps\n  // make the page load faster in case there are other resources loading.\n  // Prioritizing it implicitly means deprioritizing every other resource\n  // that’s loading on the page. Due to HTML documents usually being much\n  // smaller than other resources (notably images and JavaScript), and\n  // prefetches happening once the initial page is sufficiently loaded,\n  // this theft of bandwidth should rarely be detrimental.\n\n  linkElement.as = 'document'\n  // as=document is Chromium-only and allows cross-origin prefetches to be\n  // usable for navigation. They call it “restrictive prefetch” and intend\n  // to remove it: https://crbug.com/1352371\n  //\n  // This document from the Chrome team dated 2022-08-10\n  // https://docs.google.com/document/d/1x232KJUIwIf-k08vpNfV85sVCRHkAxldfuIA5KOqi6M\n  // claims (I haven’t tested) that data- and battery-saver modes as well as\n  // the setting to disable preloading do not disable restrictive prefetch,\n  // unlike regular prefetch. That’s good for prefetching on a touch/mouse\n  // event, but might be bad when prefetching every link in the viewport.\n\n  document.head.appendChild(linkElement)\n\n  _preloadedList.add(url)\n}\n","import * as cjsm from \"instant.page\";export default cjsm.default ?? cjsm;"],"version":3}