39 lines
1.4 KiB
HTML
39 lines
1.4 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: observe larger element with stretched background image</title>
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<body>
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<style>
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body {
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margin: 0;
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}
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#target {
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width: 200px;
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height: 150px;
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background-image: url('resources/square100.png');
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}
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</style>
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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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let 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 + '/element-timing/resources/square100.png';
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checkElement(entry, pathname, 'my_div', 'target', beforeRender,
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document.getElementById('target'));
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// The background image extends to occupy to full size of the div.
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checkRect(entry, [0, 200, 0, 150]);
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// The natural size of the square remains unchanged.
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checkNaturalSize(entry, 100, 100);
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})
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);
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observer.observe({entryTypes: ['element']});
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}, 'Element with background image shows correct image size.');
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</script>
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<div id='target' elementtiming='my_div'></div>
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</body>
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