video-poster.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /largest-contentful-paint/video-poster.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Largest Contentful Paint: observe video poster image</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/largest-contentful-paint-helpers.js"></script>

<script>

setup({"hide_test_state": true});

async_test(function (t) {

    assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");

  const beforeLoad = performance.now();

  const observer = new PerformanceObserver(

    t.step_func_done(function(entryList) {

      assert_equals(entryList.getEntries().length, 1);

      const entry = entryList.getEntries()[0];

      const url = window.location.origin + '/images/blue.png';

      // blue.png is 133 by 106.

      const size = 133 * 106;

      checkImage(entry, url, 'the_poster', size, beforeLoad);

})

);

  observer.observe({type: 'largest-contentful-paint', buffered: true});

}, "Able to observe a video's poster image.");

</script>

<video id='the_poster' src='/media/test.mp4' poster='/images/blue.png'></video>