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42 lines
1.8 KiB
HTML
42 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Largest Contentful Paint: contracted image bounded by display size.</title>
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<style type="text/css">
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#image_id {
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width: 50px;
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height: 50px;
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}
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</style>
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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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<script>
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async_test(function (t) {
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if (!window.LargestContentfulPaint) {
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assert_unreached("LargestContentfulPaint is not implemented");
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}
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let beforeRender = performance.now();
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const observer = new PerformanceObserver(
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t.step_func_done(function(entryList) {
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assert_equals(entryList.getEntries().length, 1);
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const entry = entryList.getEntries()[0];
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assert_equals(entry.entryType, 'largest-contentful-paint');
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assert_greater_than_equal(entry.renderTime, beforeRender,
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'The rendering timestamp should occur after script starts running.');
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assert_greater_than_equal(performance.now(), entry.renderTime,
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'The rendering timestamp should occur before the entry is dispatched to the observer.');
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assert_equals(entry.startTime, entry.renderTime, 'startTime should equal renderTime');
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assert_equals(entry.duration, 0);
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// black-rectangle.png is 100 x 50. It occupies 50 x 50 so size will be bounded by the displayed size.
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assert_equals(entry.size, 2500);
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assert_equals(entry.id, 'image_id');
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const pathname = window.location.origin + '/images/black-rectangle.png';
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assert_equals(entry.url, pathname);
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assert_equals(entry.element, document.getElementById('image_id'));
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})
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);
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observer.observe({type: 'largest-contentful-paint', buffered: true});
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}, 'Largest Contentful Paint: |size| attribute is bounded by display size.');
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</script>
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<img src='/images/black-rectangle.png' id='image_id'/>
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</body>
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