element-timing/image-TAO.sub.html

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: observe cross origin images with various Timing-Allow-Origin headers</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
  async_test(t => {
    assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
    const beforeRender = performance.now();
    const remote_img = 'http://{{domains[www]}}:{{ports[http][1]}}/element-timing/resources/TAOImage.py?'
        + 'origin=' + window.location.origin +'&tao=';
    const valid_tao = ['wildcard', 'origin', 'multi', 'multi_wildcard', 'match_origin', 'match_wildcard'];
    function addImage(tao) {
      const img = document.createElement('img');
      img.src = remote_img + tao;
      img.setAttribute('elementtiming', tao);
      img.id = 'id_' + tao;
      document.body.appendChild(img);
    }
    valid_tao.forEach(tao => {
      addImage(tao);
    });
    const invalid_tao = ['null', 'space', 'uppercase'];
    invalid_tao.forEach(tao => {
      addImage(tao);
    });
    let img_count = 0;
    const total_images = valid_tao.length + invalid_tao.length;
    new PerformanceObserver(
      t.step_func(entryList => {
        entryList.getEntries().forEach(entry => {
          img_count++;
          const tao = entry.identifier;
          const img = document.getElementById('id_' + tao);
          if (valid_tao.includes(tao) || invalid_tao.includes(tao)) {
            checkElement(entry, remote_img + tao, tao, 'id_' + tao, beforeRender, img);
          }
          else {
            assert_unreached('Should be in one of valid_tao OR invalid_tao');
          }
          checkNaturalSize(entry, 100, 100);
          if (img_count == total_images)
            t.done();
        });
      })
    ).observe({type: 'element', buffered: true});
  }, 'Cross-origin elements with valid TAO have correct renderTime, with invalid TAO have renderTime set to 0.');
</script>
</body>