49 lines
2.2 KiB
HTML
49 lines
2.2 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Largest Contentful Paint:dynamically appended image with different
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dimensions but same src 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/black-rectangle.png' id='image_id' width="50" />
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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 beforeSecondImageLoad = performance.now();
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let firstCallback = true;
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// black-rectangle.png is 50 x 25.
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const original_rect_size = 50 * 25;
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// The bigger black rectangle is 100 x 50, but defined with width="50".
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const bigger_rect_size = 100 * 50;
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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 + '/images/black-rectangle.png';
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if (firstCallback) {
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// Checks the original black rectangle.
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// TODO(https://crbug.com/1411616): we're testing approximated values.
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checkImage(entry, url, 'image_id', original_rect_size,
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beforeLoad, ["approximateSize"]);
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// Creates a new bigger black rectangle.
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const img = document.createElement('img');
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img.id = 'new_image_id';
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img.src = url;
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img.width = 100;
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beforeSecondImageLoad = performance.now();
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firstCallback = false;
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document.body.appendChild(img);
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} else {
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// Checks the new black rectangle.
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checkImage(entry, url, 'new_image_id', bigger_rect_size, beforeSecondImageLoad);
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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:dynamically appended image with different ' +
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'dimensions but same src triggers new entry.');
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</script>
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</body>
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