File: containertiming-observe-no-paint.html

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<!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>