29 lines
No EOL
1.2 KiB
HTML
29 lines
No EOL
1.2 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>LargestContentfulPaint entries should NOT be emitted for updates to previous LargestContentfulPaint elements.</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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<body>
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<script>
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promise_test(async (t) => {
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assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
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let lcpEntries = [];
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await new Promise(resolve => t.step_timeout(() => {
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new PerformanceObserver(list => {
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lcpEntries = lcpEntries.concat(list.getEntries())
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if (lcpEntries.length > 1) {
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assert_unreached("There shouldn't be more than 1 LCP entry for an element.");
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}
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if (lcpEntries) {
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assert_equals(lcpEntries.length, 1, "There should be only 1 LCP entry for one element. ");
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assert_equals(lcpEntries[0].id, "text", "The LCP should have id 'text'");
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resolve();
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}
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}).observe({ type: 'largest-contentful-paint', buffered: true });
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}, 200));
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})
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</script>
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<div id="text">text</div>
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<link rel="stylesheet" href="/resources/slow-style-change.py">
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</body> |