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46 lines
1.7 KiB
HTML
46 lines
1.7 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: src change triggers new entry</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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</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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<img src='resources/square100.png' elementtiming='my_image' id='my_id'/>
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<script>
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async_test(function (t) {
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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let beforeRender = performance.now();
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const img = document.getElementById('my_id');
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let firstCallback = true;
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const observer = new PerformanceObserver(
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t.step_func(entryList => {
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assert_equals(entryList.getEntries().length, 1);
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const entry = entryList.getEntries()[0];
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if (firstCallback) {
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const pathname = window.location.origin + '/element-timing/resources/square100.png';
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checkElement(entry, pathname, 'my_image', 'my_id', beforeRender, img);
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checkRect(entry, [0, 100, 0, 100]);
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checkNaturalSize(entry, 100, 100);
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// Set the src to trigger another entry.
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img.src = '/images/black-rectangle.png';
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beforeRender = performance.now();
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firstCallback = false;
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return;
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}
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const pathname = window.location.origin + '/images/black-rectangle.png';
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checkElement(entry, pathname, 'my_image', 'my_id', beforeRender, img);
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checkRect(entry, [0, 100, 0, 50]);
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checkNaturalSize(entry, 100, 50);
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t.done();
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}));
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observer.observe({type: 'element', buffered: true});
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}, 'Element Timing: changing src causes a new entry to be dispatched.');
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</script>
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</body>
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