42 lines
1.6 KiB
HTML
42 lines
1.6 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Largest Contentful Paint: largest image is reported.</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 id="target"/>
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<img id="target2"/>
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<script>
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setup({"hide_test_state": true});
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const numInitial = 100;
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const sleep = 1000;
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const small_img_src = '/images/lcp-16x16.png';
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let beforeLoad;
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async_test(function (t) {
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assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
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const img_src = '/element-timing/resources/progressive-image.py?name=square20.jpg&numInitial='
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+ numInitial + '&sleep=' + sleep;
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const img1 = document.getElementById('target')
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img1.src = img_src;
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// After a brief wait, remove the image and add a smaller image to target2.
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t.step_timeout(() => {
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img1.parentNode.removeChild(img1);
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document.getElementById('target2').src = small_img_src;
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beforeLoad = performance.now();
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}, 0);
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new PerformanceObserver(
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t.step_func(entryList => {
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let images = entryList.getEntries().filter(e => e.id !== '');
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if (!images.length)
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return;
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assert_equals(images.length, 1, 'Should only receive one entry');
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const entry = images[0];
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checkImage(images[0], window.location.origin + small_img_src, 'target2', 16 * 16,
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beforeLoad);
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t.done();
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})
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).observe({type: 'largest-contentful-paint', buffered: true});
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}, 'Largest Contentful Paint: image removed before loaded does not produce entry.');
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</script>
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</body>
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