list-style-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/list-style-image.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<head>

<meta charset=utf-8>

<title>Element Timing: observe an li using an image list style</title>

<style>

body {

  margin: 20px;

ul {

  list-style-image: url('/images/green-100x50.png');

  padding-inline-start: 0px;

  margin: 0px;

  list-style-type: none;

  list-style-position: inside;

</style>

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

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

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

<script>

  async_test(function (t) {

    let beforeRender;

    let li;

    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/green-100x50.png';

        checkElement(entry, pathname, 'my_li', 'li_with_image', beforeRender, li);

        checkRect(entry, [20, 120, 20, 70]);

        checkNaturalSize(entry, 100, 50);

})

);

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

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

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

    window.onload = () => {

      const ul = document.createElement('ul');

      li = document.createElement('li');

      li.id = 'li_with_image'

      li.setAttribute('elementtiming', 'my_li');

      ul.appendChild(li);

      document.body.appendChild(ul);

      beforeRender = performance.now();

};

  }, 'Element with an li using an image list style.');

</script>

</head>