38 lines
1.6 KiB
HTML
38 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>Performance Paint Timing: Check that paintTime/presentationTime are available</title>
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</head>
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<body>
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<script src="resources/utils.js"></script>
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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>
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setup({"hide_test_state": true});
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promise_test(async t => {
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assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
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assert_implements("paintTime" in window.PerformancePaintTiming.prototype, "Paint Timing doesn't expose `paintTime`");
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await new Promise(r => window.addEventListener('load', r));
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await assertNoFirstContentfulPaint(t);
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const img = document.createElement('img');
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img.src = 'resources/circles.png';
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document.body.append(img);
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const reference_time = performance.now();
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const performance_entry_promise = new Promise(resolve => {
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new PerformanceObserver(entries => {
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const [entry] = entries.getEntriesByName("first-contentful-paint");
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if (entry)
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resolve(entry);
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}).observe({type: "paint"});
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});
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const entry = await performance_entry_promise;
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assert_greater_than(entry.paintTime, reference_time);
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if ("presentationTime" in entry && entry.presentationTime !== null) {
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assert_greater_than(entry.presentationTime, entry.paintTime);
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assert_equals(entry.presentationTime, entry.startTime);
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} else {
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assert_equals(entry.paintTime, entry.startTime);
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}
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}, "Paint timing entries should expose paintTime and presentationTime");
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</script>
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</body>
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</html>
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