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Still should feel the same to the user, just MUCH faster to initialize and paint.\n *\n * Thx to these as the inspiration\n *   https://storage.googleapis.com/amp-vs-non-amp/youtube-lazy.html\n *   https://autoplay-youtube-player.glitch.me/\n *\n * Once built it, I also found these:\n *   https://github.com/ampproject/amphtml/blob/master/extensions/amp-youtube (👍👍)\n *   https://github.com/Daugilas/lazyYT\n *   https://github.com/vb/lazyframe\n */\nclass LiteYTEmbed extends HTMLElement {\n    constructor() {\n        super();\n\n        // Gotta encode the untrusted value\n        // https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html#rule-2---attribute-escape-before-inserting-untrusted-data-into-html-common-attributes\n        this.videoId = encodeURIComponent(this.getAttribute('videoid'));\n\n        /**\n         * Lo, the youtube placeholder image!  (aka the thumbnail, poster image, etc)\n         * There is much internet debate on the reliability of thumbnail URLs. Weak consensus is that you\n         * cannot rely on anything and have to use the YouTube Data API.\n         *\n         * amp-youtube also eschews using the API, so they just try sddefault with a hqdefault fallback:\n         *   https://github.com/ampproject/amphtml/blob/6039a6317325a8589586e72e4f98c047dbcbf7ba/extensions/amp-youtube/0.1/amp-youtube.js#L498-L537\n         * For now I'm gonna go with this confident (lol) assertion: https://stackoverflow.com/a/20542029, though I'll use `i.ytimg` to optimize for origin reuse.\n         *\n         * Worth noting that sddefault is _higher_ resolution than hqdefault. Naming is hard. ;)\n         * From my own testing, it appears that hqdefault is ALWAYS there sddefault is missing for ~10% of videos\n         *\n         * TODO: Do the sddefault->hqdefault fallback\n         *       - When doing this, apply referrerpolicy (https://github.com/ampproject/amphtml/pull/3940)\n         * TODO: Consider using webp if supported, falling back to jpg\n         */\n        this.posterUrl = `https://i.ytimg.com/vi/${this.videoId}/hqdefault.jpg`;\n        // Warm the connection for the poster image\n        LiteYTEmbed.addPrefetch('preload', this.posterUrl, 'image');\n        // TODO: support dynamically setting the attribute via attributeChangedCallback\n    }\n\n    connectedCallback() {\n        this.style.backgroundImage = `url(\"${this.posterUrl}\")`;\n\n        const playBtn = document.createElement('div');\n        playBtn.classList.add('lty-playbtn');\n        this.append(playBtn);\n\n        // On hover (or tap), warm up the TCP connections we're (likely) about to use.\n        this.addEventListener('pointerover', LiteYTEmbed.warmConnections, {once: true});\n\n        // Once the user clicks, add the real iframe and drop our play button\n        // TODO: In the future we could be like amp-youtube and silently swap in the iframe during idle time\n        //   We'd want to only do this for in-viewport or near-viewport ones: https://github.com/ampproject/amphtml/pull/5003\n        this.addEventListener('click', e => this.addIframe());\n    }\n\n    // // TODO: Support the the user changing the [videoid] attribute\n    // attributeChangedCallback() {\n    // }\n\n    /**\n     * Add a <link rel={preload | preconnect} ...> to the head\n     */\n    static addPrefetch(kind, url, as) {\n        const linkElem = document.createElement('link');\n        linkElem.rel = kind;\n        linkElem.href = url;\n        if (as) {\n            linkElem.as = as;\n        }\n        linkElem.crossorigin = true;\n        document.head.append(linkElem);\n    }\n\n    /**\n     * Begin pre-connecting to warm up the iframe load\n     * Since the embed's network requests load within its iframe,\n     *   preload/prefetch'ing them outside the iframe will only cause double-downloads.\n     * So, the best we can do is warm up a few connections to origins that are in the critical path.\n     *\n     * Maybe `<link rel=preload as=document>` would work, but it's unsupported: http://crbug.com/593267\n     * But TBH, I don't think it'll happen soon with Site Isolation and split caches adding serious complexity.\n     */\n    static warmConnections() {\n        if (LiteYTEmbed.preconnected) return;\n\n        // The iframe document and most of its subresources come right off youtube.com\n        LiteYTEmbed.addPrefetch('preconnect', 'https://www.youtube-nocookie.com');\n        // The botguard script is fetched off from google.com\n        LiteYTEmbed.addPrefetch('preconnect', 'https://www.google.com');\n\n        // Not certain if these ad related domains are in the critical path. Could verify with domain-specific throttling.\n        LiteYTEmbed.addPrefetch('preconnect', 'https://googleads.g.doubleclick.net');\n        LiteYTEmbed.addPrefetch('preconnect', 'https://static.doubleclick.net');\n\n        LiteYTEmbed.preconnected = true;\n    }\n\n    addIframe(){\n        const iframeHTML = `\n<iframe width=\"560\" height=\"315\" frameborder=\"0\"\n  allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\n  src=\"https://www.youtube-nocookie.com/embed/${this.videoId}?autoplay=1&showinfo=0&iv_load_policy=3&rel=0\"\n></iframe>`;\n        this.insertAdjacentHTML('beforeend', iframeHTML);\n        this.classList.add('lyt-activated');\n    }\n}\n// Register custome element\ncustomElements.define('lite-youtube', LiteYTEmbed);\n"],"sourceRoot":""}