containertiming-with-child-video.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /container-timing/tentative/containertiming-with-child-video.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Container Timing: observe with a node with containertiming and a video poster child</title>

<body>

<style>

body {

  margin: 0;

</style>

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

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

<script src="/container-timing/resources/container-timing-helpers.js"></script>

<script>

  let beforeRender;

  async_test(function (t) {

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

    const observer = new PerformanceObserver(

      t.step_func_done(function(entryList) {

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

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

        checkContainerEntry(entry, 'div_ct', 'video_id', beforeRender);

        assert_greater_than(entry.size, 0, 'size should be greater than 0');

})

);

    observer.observe({entryTypes: ['container']});

    // Add a div that is the container timing root

    const div = document.createElement('div');

    div.setAttribute('containertiming', 'div_ct');

    document.body.appendChild(div);

    // Add video element with poster image (for reliable testing without actual playback)

    const video = document.createElement('video');

    video.setAttribute('id', 'video_id');

    video.poster = '/container-timing/resources/square100.png';

    video.width = 100;

    video.height = 100;

    div.appendChild(video);

    beforeRender = performance.now();

  }, 'Paint of the video poster child of container timing is reported.');

</script>

</body>