50 lines
1.8 KiB
HTML
50 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: image with rotation.</title>
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<head>
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<style>
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body {
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margin: 0px;
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}
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.my_div {
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width: 100px;
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height: 50px;
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transform: rotate(45deg);
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transform-origin: top left;
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}
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</style>
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</head>
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<body>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="resources/element-timing-helpers.js"></script>
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<script>
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const beforeRender = performance.now();
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async_test(function (t) {
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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const observer = new PerformanceObserver(
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t.step_func_done(function(entryList) {
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assert_equals(entryList.getEntries().length, 1);
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const entry = entryList.getEntries()[0];
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const pathname = window.location.origin + '/images/black-rectangle.png';
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checkElement(entry, pathname, 'rectangle', 'rect_id', beforeRender,
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document.getElementById('rect_id'));
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checkNaturalSize(entry, 100, 50);
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const rect = entry.intersectionRect;
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// The div rotates with respect to the origin, so part of it will be invisible.
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// The width of the visible part will be 100 / sqrt(2) and the height will be
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// 100 / sqrt(2) + 50 / sqrt(2).
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assert_equals(rect.left, 0);
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// Checking precision only to the nearest integer.
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assert_equals(Math.round(rect.right), 71);
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assert_equals(rect.top, 0);
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assert_equals(Math.round(rect.bottom), 106);
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})
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);
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observer.observe({entryTypes: ['element']});
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}, 'Image intersectionRect is affected by rotation, but not its intrinsic size.');
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</script>
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<div class="my_div" id="div_id">
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<img src="/images/black-rectangle.png" elementtiming="rectangle" id="rect_id"/>
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</div>
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</body>
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