45 lines
1.8 KiB
HTML
45 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>Performance Paint Timing Test: child ignores parent FCP</title>
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<meta name="timeout" content="long">
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</head>
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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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<iframe src='../resources/subframe-sending-paint.html' id='child-iframe'></iframe>
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<img src='../resources/circles.png'/>
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<script>
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setup({"hide_test_state": true});
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async_test(function (t) {
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assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
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window.addEventListener('message', t.step_func(e => {
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// Child iframe should not have any paint-timing entries.
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assert_equals(e.data, '0');
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t.done();
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}));
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// Wait for onload to ensure img and iframe have loaded.
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window.addEventListener('load', function() {
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function testPaintEntries() {
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const bufferedEntries = performance.getEntriesByType('paint');
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if (bufferedEntries.length < 2) {
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t.step_timeout(testPaintEntries, 20);
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return;
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}
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t.step(function() {
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assert_equals(bufferedEntries.length, 2, 'There should be two paint timing instances.');
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assert_equals(bufferedEntries[0].entryType, 'paint');
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assert_equals(bufferedEntries[0].name, 'first-paint');
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assert_equals(bufferedEntries[1].entryType, 'paint');
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assert_equals(bufferedEntries[1].name, 'first-contentful-paint');
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// Ask child iframe to send its paint-timing entries.
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document.getElementById('child-iframe').
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contentWindow.postMessage('', '*');
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})
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}
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testPaintEntries();
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});
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}, 'Child iframe ignores paint-timing events fired from parent image rendering.');
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</script>
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</body>
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</html>
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