36 lines
1.4 KiB
HTML
36 lines
1.4 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: observe generated CSS text</title>
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<style>
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p::before {
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content: "Generated text prefix";
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}
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body {
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margin: 20px;
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}
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</style>
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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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<p elementtiming='my_text' id='text_id'></p>
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<script>
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async_test(function (t) {
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const beforeRender = performance.now();
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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const observer = new PerformanceObserver(
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t.step_func_done(function(entryList) {
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assert_equals(entryList.getEntries().length, 1);
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const entry = entryList.getEntries()[0];
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checkTextElement(entry, 'my_text', 'text_id', beforeRender, document.getElementById('text_id'));
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assert_equals(entry.intersectionRect.left, 20, 'left should be 20.');
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assert_equals(entry.intersectionRect.top, 20, 'top should be 20.');
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// Try a lower bound of height=10, width=80 for the generated text.
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assert_greater_than_equal(entry.intersectionRect.right, 100);
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assert_greater_than_equal(entry.intersectionRect.bottom, 30);
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})
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);
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observer.observe({type: 'element', buffered: true});
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}, 'Generated text content is observable.');
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</script>
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</body>
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