30 lines
1.2 KiB
HTML
30 lines
1.2 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Largest Contentful Paint: src change triggers new entry.</title>
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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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<img src='/images/lcp-1x1.png' id='image_id' width="133" height="106"/>
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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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document.getElementById('image_id').src = '/images/lcp-133x106.png';
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const url = window.location.origin + '/images/lcp-133x106.png';
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const observer = new PerformanceObserver(
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t.step_func(function(entryList) {
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let entries = entryList.getEntries().filter(e => e.url === url);
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if (entries.length === 0)
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return;
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assert_equals(entries.length, 1);
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const entry = entries[0];
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const size = 133 * 106;
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checkImage(entry, url, 'image_id', size, beforeLoad);
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t.done();
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})
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);
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observer.observe({type: 'largest-contentful-paint', buffered: true});
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}, 'Largest Contentful Paint: changing src causes a new entry to be dispatched.');
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</script>
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</body>
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