nested-containertiming-on-img-without-ignore.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /container-timing/tentative/nested-containertiming-on-img-without-ignore.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Container Timing: an image with containertiming (no ignore) inside an outer containertiming root</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, 2,

            'two entries expected: one for the image root, one for the outer root');

        const entries = entryList.getEntries();

        const entry_outer = entries.find(e => e.identifier == 'outer_ct');

        checkContainerEntry(entry_outer, 'outer_ct', 'my_id', beforeRender);

        checkContainerIntersectionRect(entry_outer, [0, 100, 0, 100]);

        checkContainerSize(entry_outer, 10000);

        const entry_image = entries.find(e => e.identifier == 'image_ct');

        checkContainerEntry(entry_image, 'image_ct', 'my_id', beforeRender);

        checkContainerIntersectionRect(entry_image, [0, 100, 0, 100]);

        checkContainerSize(entry_image, 10000);

})

);

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

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

    outer.setAttribute('containertiming', 'outer_ct');

    document.body.appendChild(outer);

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

    img.src = '/container-timing/resources/square100.png';

    img.setAttribute('containertiming', 'image_ct');

    img.setAttribute('id', 'my_id');

    outer.appendChild(img);

    beforeRender = performance.now();

  }, 'Image with containertiming (no ignore) inside outer containertiming reports under itself and propagates to the outer root.');

</script>

</body>