38 lines
1.6 KiB
HTML
38 lines
1.6 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: observe with empty elementtiming attribute</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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<script src="resources/element-timing-helpers.js"></script>
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<script>
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let beforeRender;
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async_test(function (t) {
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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let observedImage = false;
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let observedText = 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.name === 'image-paint') {
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assert_false(observedImage, 'Image should only be observed once.');
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const pathname = window.location.origin + '/element-timing/resources/square20.png';
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checkElement(entry, pathname, '', 'square', beforeRender,
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document.getElementById('square'));
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checkNaturalSize(entry, 20, 20);
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observedImage = true;
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} else {
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assert_false(observedText, 'Text should only be observed once.');
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checkTextElement(entry, '', 'text', beforeRender, document.getElementById('text'));
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observedText = true;
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}
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});
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if (observedImage && observedText)
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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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beforeRender = performance.now();
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}, "Able to observe image and text with empty elementtiming attribute.");
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</script>
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<img id='square' src='resources/square20.png' elementtiming/>
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<p id='text' elementtiming>Text!</p>
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