<!doctype html> <html> <title>This test verifies a video element of data uri src triggers an LCP entry to be emitted</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <body> <script> const get_lcp_entry = () => { return new Promise(resolve => { new PerformanceObserver((list, observer) => { if (list.getEntries()) { observer.disconnect(); resolve(list.getEntries()[0]); } }).observe({ type: "largest-contentful-paint", buffered: true }); }); }; promise_test(async t => { lcpEntry = await get_lcp_entry(); assert_true(lcpEntry.url.startsWith('data:video/mp4;base64,T2dnUwAC')); }, "Video of data URI src should trigger an LCP entry to be emitted.") </script> <!-- This is the base64 encoding of the images/pattern.ogv video file. --> <video autoplay muted src="data:video/mp4;base64,T2dnUwACAAAAAAAAAADmWaI+AAAAAKRLSUwBKoB0aGVvcmEDAgEAAgACAAAUAAAUAAwAAAAeAAAA AQAAAQAAAQAAAACw2E9nZ1MAAAAAAAAAAAAA5lmiPgEAAADp90reDj////////////////+QgXRo 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