element-timing/image-rect-iframe.html

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: check intersectionRect for element in iframe</title>
<body>
<style>
body {
  margin: 50px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  async_test((t) => {
    assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
    on_event(window, 'message', e => {
      assert_equals(e.data.length, 1);
      assert_equals(e.data.entryType, 'element');
      const rect = e.data.rect;
      // rect should start at (0,0) even though main frame has a margin.
      assert_equals(rect.left, 0);
      assert_equals(rect.right, 100);
      assert_equals(rect.top, 0);
      assert_equals(rect.bottom, 100);
      assert_equals(e.data.naturalWidth, 100);
      assert_equals(e.data.naturalHeight, 100);
      assert_equals(e.data.id, 'iframe_img_id');
      assert_equals(e.data.elementId, 'iframe_img_id');
      t.done();
    });
  }, 'Element Timing entry in iframe has coordinates relative to the iframe.');
</script>
<iframe src="resources/iframe-with-square-sends-entry.html"></iframe>
</body>