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36 lines
1.5 KiB
HTML
36 lines
1.5 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/blue.png' id='image_id'/>
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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 observer = new PerformanceObserver(
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t.step_func(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 url = window.location.origin + (firstCallback ? '/images/blue.png' : '/images/black-rectangle.png');
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// blue.png is 133 by 106. black-rectangle.png is 100 x 50.
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const size = firstCallback ? 133 * 106 : 100 * 50;
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checkImage(entry, url, 'image_id', size, beforeLoad);
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if (firstCallback) {
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// Set the src to trigger another entry.
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const img = document.getElementById('image_id');
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img.src = '/images/black-rectangle.png';
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beforeLoad = performance.now();
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firstCallback =false;
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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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}, '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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