image-with-rotation.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/image-with-rotation.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Element Timing: image with rotation.</title>

<head>

<style>

body {

  margin: 0px;

.my_div {

  width: 100px;

  height: 50px;

  transform: rotate(45deg);

  transform-origin: top left;

</style>

</head>

<body>

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

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

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

<script>

  const 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, 'rectangle', 'rect_id', beforeRender,

            document.getElementById('rect_id'));

        checkNaturalSize(entry, 100, 50);

        const rect = entry.intersectionRect;

        // The div rotates with respect to the origin, so part of it will be invisible.

        // The width of the visible part will be 100 / sqrt(2) and the height will be

        // 100 / sqrt(2) + 50 / sqrt(2).

        assert_equals(rect.left, 0);

        // Checking precision only to the nearest integer.

        assert_equals(Math.round(rect.right), 71);

        assert_equals(rect.top, 0);

        assert_equals(Math.round(rect.bottom), 106);

})

);

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

  }, 'Image intersectionRect is affected by rotation, but not its intrinsic size.');

</script>

<div class="my_div" id="div_id">

  <img src="/images/black-rectangle.png" elementtiming="rectangle" id="rect_id"/>

</div>

</body>