29 lines
1.1 KiB
HTML
29 lines
1.1 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<title>Largest Contentful Paint: observe element with css generated image</title>
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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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<style>
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#target::before {
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content: url('/images/black-rectangle.png');
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}
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</style>
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<body>
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<p id="target"></p>
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<script>
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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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let beforeLoad = performance.now();
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let observedFirstLetter = false;
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const observer = new PerformanceObserver(
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t.step_func_done(function(entryList) {
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const entry = entryList.getEntries()[entryList.getEntries().length -1];
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const url = window.location.origin + '/images/black-rectangle.png';
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checkImage(entry, url, 'target', 0, beforeLoad, ['sizeLowerBound']);
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}));
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observer.observe({entryTypes: ['largest-contentful-paint']});
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}, 'Largest Contentful Paint: CSS generated image is observable.');
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</script>
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</body>
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