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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: observe large elements</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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<script>
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let beforeRender;
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async_test(function (t) {
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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 index = window.location.href.lastIndexOf('/');
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const pathname = window.location.href.substring(0, index) +
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'/resources/square20.jpg';
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checkElement(entry, pathname, '', 'large_one', beforeRender);
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// Assume viewport hasn't changed, so the element occupies all of it.
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checkRect(entry,
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[0, document.documentElement.clientWidth, 0, document.documentElement.clientHeight]);
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checkNaturalSize(entry, 20, 20);
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})
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);
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observer.observe({entryTypes: ['element']});
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// We add the image during onload to be sure that the observer is registered
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// in time for it to observe the element timing.
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window.onload = () => {
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// Add an image setting width and height equal to viewport.
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const img = document.createElement('img');
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img.src = 'resources/square20.jpg';
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img.width = document.documentElement.clientWidth;
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img.height = document.documentElement.clientHeight;
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img.setAttribute('id', 'large_one');
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document.body.appendChild(img);
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beforeRender = performance.now();
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};
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}, 'Large img element is observable.');
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</script>
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</body>
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