containertiming-observe-no-paint.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/containertiming-observe-no-paint.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Container Timing: if no paint happens, observer is not called</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 src="/element-timing/resources/element-timing-helpers.js"></script>

<script>

  async_test(function (t) {

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

    const observer = new PerformanceObserver(

      function(entryList) {

        assert_unreached("No entry is expected with nothing to paint");

);

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

    finishOnElementTiming(t);

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

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

    document.body.appendChild(div);

    addPaintingElementTimingAfterDoubleRAF(document.body);

  }, 'Container timing did not report paints when there was nothing to paint.');

</script>

</body>