pseudo-with-image-content-in-container-timing.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/pseudo-with-image-content-in-container-timing.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<head>

<meta charset=utf-8>

<title>Container Timing: observe a node with a pseudo image before inside a container timing root</title>

<style>

body {

  margin: 0;

.has_before_pseudo::before {

  content: url('/container-timing/resources/square100.png');

  width: 120px;

  height: 120px;

  display: inline-block;

</style>

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

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

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

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

<script>

  async_test(function (t) {

    let beforeRender;

    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, 'ct', 'hbp_id', beforeRender);

        // content image does not repeat, so its size is the original one.

        checkRect(entry, [0, 100, 0, 100])

        checkContainerSize(entry, 10000);

})

);

    observer.observe({type: 'container', buffered: true});

    beforeRender = performance.now();

  }, 'Element with a pseudo image before as background inside a container timing that is observed.');

</script>

</head>

<body>

<div id="ct_id" containertiming="ct">

  <div class="has_before_pseudo" id="hbp_id"></div>

</div>

</body>