48 lines
1.4 KiB
HTML
48 lines
1.4 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Layout Instability: toJSON</title>
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<body>
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<style>
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#myDiv { position: relative; width: 300px; height: 100px; background: blue; }
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</style>
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<div id='myDiv'></div>
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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/util.js"></script>
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<script>
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promise_test(async t => {
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assert_implements(window.LayoutShift, 'Layout Instability is not supported.');
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// Wait for the initial render to complete.
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await waitForAnimationFrames(2);
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return new Promise(resolve => {
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const observer = new PerformanceObserver(
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t.step_func(entryList => {
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const entry = entryList.getEntries()[0];
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assert_equals(typeof(entry.toJSON), 'function');
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const json = entry.toJSON();
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assert_equals(typeof(json), 'object');
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const keys = [
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// PerformanceEntry
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'name',
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'entryType',
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'startTime',
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'duration',
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// LayoutShift
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'value',
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'hadRecentInput',
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'lastInputTime',
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];
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for (const key of keys) {
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assert_equals(json[key], entry[key],
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`LayoutShift ${key} entry does not match its toJSON value`);
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}
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resolve();
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})
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);
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observer.observe({type: 'layout-shift'});
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document.getElementById('myDiv').style = "top: 60px";
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});
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}, 'Test toJSON() in LayoutShift.');
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</script>
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</body>
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