48 lines
1.7 KiB
HTML
48 lines
1.7 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: observe text</title>
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<body>
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<style>
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body {
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margin: 20px;
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}
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p {
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font-size: 12px;
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}
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</style>
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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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<script>
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async_test((t) => {
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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let paragraph;
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let beforeRender;
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const observer = new PerformanceObserver(
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t.step_func_done((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, paragraph);
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assert_equals(entry.intersectionRect.left, 20, 'left should be 20.');
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// Text box size will vary from device to device, so try lower bounding height by 12, width by 100.
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assert_greater_than_equal(entry.intersectionRect.right, 120);
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assert_equals(entry.intersectionRect.top, 20, 'top should be 20.');
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assert_greater_than_equal(entry.intersectionRect.bottom, 32);
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})
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);
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observer.observe({entryTypes: ['element']});
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// We add the iframe during onload to be sure that the observer is registered
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// in time for it to observe the element timing.
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window.onload = () => {
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paragraph = document.createElement('p');
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paragraph.innerHTML = 'This is text I care about';
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paragraph.setAttribute('elementtiming', 'my_text');
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paragraph.setAttribute('id', 'text_id');
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document.body.appendChild(paragraph);
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beforeRender = performance.now();
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};
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}, 'Paragraph with elementtiming attribute is observed.');
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</script>
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</body>
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