31 lines
1.3 KiB
HTML
31 lines
1.3 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: do not observe a disconnected image</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>
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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 observer = new PerformanceObserver(
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t.step_func_done(() => {
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// The image should not have caused an entry, so fail test.
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assert_unreached('Should not have received an entry!');
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})
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);
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observer.observe({entryTypes: ['element']});
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// We add the image 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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// Add image of width equal to 100 and height equal to 100.
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const img = document.createElement('img');
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img.src = 'resources/square100.png';
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img.setAttribute('elementtiming', 'my_image');
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img.setAttribute('id', 'my_id');
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// Image has been created but not added.
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// Wait for 500ms and end test, ensuring no entry was created.
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t.step_timeout(() => {
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t.done();
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}, 500);
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};
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}, 'Image which is not added to DOM tree is not observable.');
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</script>
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