cross-origin-element.sub.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:
- /element-timing/cross-origin-element.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Element Timing: observe cross-origin images but without renderTime</title>

<body>

<style>

body {

  margin: 0;

</style>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/element-timing-helpers.js"></script>

<script>

  async_test((t) => {

    const test_start = performance.now();

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

    let img;

    const pathname = 'http://{{domains[www]}}:{{ports[http][1]}}'

          + '/element-timing/resources/square100.png';

    const observer = new PerformanceObserver(

      t.step_func_done((entryList) => {

        assert_equals(entryList.getEntries().length, 1);

        const entry = entryList.getEntries()[0];

        checkElement(entry, pathname, 'my_image', 'the_id', test_start, img);

         assert_greater_than_equal(entry.renderTime, entry.loadTime,

          'The renderTime of a cross-origin image should be coarse but at least as high as loadTime');

        checkRect(entry, [0, 100, 0, 100]);

        checkNaturalSize(entry, 100, 100);

})

);

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

    // We add the image during onload to be sure that the observer is registered

    // in time for it to observe the element timing.

    // TODO(npm): change observer to use buffered flag.

    window.onload = t.step_func(() => {

      // Add a cross origin image resource.

      img = document.createElement('img');

      img.src = pathname;

      img.setAttribute('elementtiming', 'my_image');

      img.setAttribute('id', 'the_id');

      document.body.appendChild(img);

});

  }, 'Cross-origin image element is NOT observable.');

</script>

</body>