observe-background-image.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/observe-background-image.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Element Timing: observe element with background image</title>

<body>

<style>

body {

  margin: 0;

#target {

  width: 100px;

  height: 50px;

  background-image: url('/images/black-rectangle.png');

</style>

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

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

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

<script>

  let beforeRender = performance.now();

  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 + '/images/black-rectangle.png';

        checkElement(entry, pathname, 'my_div', 'target', beforeRender,

            document.getElementById('target'));

        checkRect(entry, [0, 100, 0, 50]);

        checkNaturalSize(entry, 100, 50);

})

);

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

  }, 'Element with elementtiming attribute and background image is observable.');

</script>

<div id='target' elementtiming='my_div'></div>

</body>