<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: observe video poster image</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
let beforeRender;
async_test(function (t) {
  assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
  const observer = new PerformanceObserver(
    t.step_func_done(function(entryList) {
      assert_equals(entryList.getEntries().length, 1);
      const entry = entryList.getEntries()[0];
      const pathname = window.location.origin + '/element-timing/resources/circle.svg';
      checkElement(entry, pathname, 'my_poster', 'the_poster', beforeRender,
          document.getElementById('the_poster'));
      // Assume viewport has size at least 200, so the element is fully visible.
      checkRect(entry, [0, 200, 0, 200]);
      checkNaturalSize(entry, 200, 200);
    })
  );
  observer.observe({entryTypes: ['element']});
  beforeRender = performance.now();
}, "Able to observe a video's poster image.");
</script>
<style>
body {
  margin: 0;
}
</style>
<video elementtiming='my_poster' id='the_poster' src='/media/test.mp4' poster='resources/circle.svg'/>