45 lines
1.8 KiB
HTML
45 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Largest Contentful Paint: size when image overflows</title>
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<!-- In this test, an image with an intrinsic size of 100 x 50 is added, but
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scaled up in order to overflow the viewport. It should not be reported. -->
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<body>
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<style>
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body {
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margin: 0px;
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}
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</style>
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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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const viewportWidth = document.documentElement.clientWidth;
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const viewportHeight = document.documentElement.clientHeight;
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setup({"hide_test_state": true});
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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 beforeLoad = performance.now();
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new PerformanceObserver(
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t.step_func_done(function(entryList) {
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assert_equals(entryList.getEntries().length, 1, 'Should have received only one entry!');
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const entry = entryList.getEntries()[0];
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if (entry.url)
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assert_unreached('Should not have received an image entry!');
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})
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).observe({type: 'largest-contentful-paint', buffered: true});
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// Add an image, setting width and height equal to viewport.
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img = document.createElement('img');
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img.src = '/images/lcp-100x50.png';
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img.id = 'image_id';
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img.width = viewportWidth * 2;
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img.height = viewportHeight * 2;
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img.onload = () => {
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const p = document.createElement('p');
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p.innerHTML = 'a';
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p.style = 'position: absolute; top: 10px; left: 10px;';
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document.body.appendChild(p);
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}
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document.body.appendChild(img);
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}, 'The intersectionRect of an img element overflowing is computed correctly');
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</script>
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</body>
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