image-removed-before-load.html

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This WPT test may be referenced by the following Test IDs:
- /largest-contentful-paint/image-removed-before-load.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Largest Contentful Paint: largest image is reported.</title>

<body>

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

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

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

<img id="target"/>

<img id="target2"/>

<script>

  setup({"hide_test_state": true});

  const numInitial = 100;

  const sleep = 1000;

  const small_img_src = '/images/lcp-16x16.png';

  let beforeLoad;

  async_test(function (t) {

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

    const img_src = '/element-timing/resources/progressive-image.py?name=square20.jpg&numInitial='

      + numInitial + '&sleep=' + sleep;

    const img1 = document.getElementById('target')

    img1.src = img_src;

    // After a brief wait, remove the image and add a smaller image to target2.

    t.step_timeout(() => {

      img1.parentNode.removeChild(img1);

      document.getElementById('target2').src = small_img_src;

      beforeLoad = performance.now();

    }, 0);

    new PerformanceObserver(

      t.step_func(entryList => {

        let images = entryList.getEntries().filter(e => e.id !== '');

        if (!images.length)

          return;

        assert_equals(images.length, 1, 'Should only receive one entry');

        const entry = images[0];

        checkImage(images[0], window.location.origin + small_img_src, 'target2', 16 * 16,

            beforeLoad);

        t.done();

})

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

  }, 'Largest Contentful Paint: image removed before loaded does not produce entry.');

</script>

</body>