containertiming-and-ignore-on-text-itself.html

Enable keyboard shortcuts

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/containertiming-and-ignore-on-text-itself.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Container Timing: observe a paragraph with both containertiming and containertiming-ignore</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, 'p_ct', 'my_id', beforeRender);

        // The exact text size depends on font metrics, so unlike the image

        // version we only assert the painted area and intersection rect are

        // non-zero (symmetry with containertiming-and-ignore-on-img-itself).

        assert_greater_than(entry.size, 0, 'container size should be non-zero');

        assert_greater_than(

            entry.intersectionRect.right - entry.intersectionRect.left, 0,

            'intersection rect width should be non-zero');

        assert_greater_than(

            entry.intersectionRect.bottom - entry.intersectionRect.top, 0,

            'intersection rect height should be non-zero');

})

);

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

    // Add a paragraph that is itself a container timing root AND has

    // containertiming-ignore set. containertiming-ignore only blocks upward

    // propagation to ancestor roots; the element's own text paint still

    // reports under its own root.

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

    p.setAttribute('containertiming', 'p_ct');

    p.setAttribute('containertiming-ignore', '');

    p.id = 'my_id';

    p.innerText = "This is a text";

    document.body.appendChild(p);

    beforeRender = performance.now();

  }, 'Text element with both containertiming and containertiming-ignore reports its own paint.');

</script>

</body>