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47 lines
1.7 KiB
HTML
47 lines
1.7 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Largest Contentful Paint: repeated image.</title>
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<style>
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#image_id {
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width: 10px;
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height: 10px;
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}
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</style>
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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/largest-contentful-paint-helpers.js"></script>
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<script>
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async_test(function (t) {
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assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
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let beforeLoad = performance.now();
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let firstCallback = true;
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const url = window.location.origin + '/images/black-rectangle.png';
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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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// First image is shrunk to be 10 x 10. The second image is added at its natural size: 100 x 50.
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const size = firstCallback ? 10 * 10 : 100 * 50;
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const id = firstCallback ? 'image_id' : 'second_id';
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checkImage(entry, url, id, size, beforeLoad);
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if (firstCallback) {
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const img = document.createElement('img');
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img.src = '/images/black-rectangle.png';
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img.id = 'second_id';
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beforeLoad = performance.now();
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document.getElementById('image_div').appendChild(img);
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firstCallback = false;
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return;
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} else {
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t.done();
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}
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})
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);
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observer.observe({type: 'largest-contentful-paint', buffered: true});
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}, 'Repeated image produces different timestamps.');
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</script>
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<img src='/images/black-rectangle.png' id='image_id'/>
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<div id='image_div'></div>
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</body>
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