54 lines
1.9 KiB
HTML
54 lines
1.9 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: observe text with display style.</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/element-timing-helpers.js"></script>
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<style>
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h1 {
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display: flex;
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}
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h2 {
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display: grid;
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}
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h3 {
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display: block;
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}
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</style>
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<h1 id='title1' elementtiming='h1'>I am h1</h1>
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<h2 id='title2' elementtiming='h2'>I am h2</h2>
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<h3 id='title3' elementtiming='h3'>I am h3</h3>
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<script>
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async_test(function (t) {
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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const beforeRender = performance.now();
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let observedFlex = false;
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let observedGrid = false;
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let observedBlock = false;
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const observer = new PerformanceObserver(
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t.step_func(function(entryList) {
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entryList.getEntries().forEach(entry => {
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if (entry.id === 'title1') {
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assert_false(observedFlex, 'Should observe flex once');
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observedFlex = true;
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checkTextElement(entry, 'h1', 'title1', beforeRender, document.getElementById('title1'));
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} else if (entry.id === 'title2') {
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assert_false(observedGrid, 'Should observe grid once');
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observedGrid = true;
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checkTextElement(entry, 'h2', 'title2', beforeRender, document.getElementById('title2'));
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} else {
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assert_equals(entry.id, 'title3', 'ID should be title1, title2, or title3');
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assert_false(observedBlock, 'Should observe block once');
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observedBlock = true;
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checkTextElement(entry, 'h3', 'title3', beforeRender, document.getElementById('title3'));
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}
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});
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if (observedFlex && observedGrid && observedBlock)
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t.done();
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})
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);
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observer.observe({type: 'element', buffered: true});
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}, 'Text with display style is observable.');
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</script>
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</body>
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