Blink WPT Bot
73ed8a02ee
Automatic update from web-platform-tests LCP/elementTiming: Expose 4ms-coarsened renderTime regardless of TAO (#48740) Cross-origin isolation is more appropriate for render times than TAO, as it's a document-level protection rather than resource-level. Using FloorToMultiple instead of TimeClamper, as randomization is both unnecessary here, and would create incompatible results between different entries. Bug: 373263977 Change-Id: I7715d26c7732b69078aa5bb2ce8614100932e971 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5930666 Reviewed-by: Michal Mocny <mmocny@chromium.org> Commit-Queue: Noam Rosenthal <nrosenthal@chromium.org> Reviewed-by: Ian Clelland <iclelland@chromium.org> Cr-Commit-Position: refs/heads/main@{#1374558} Co-authored-by: Noam Rosenthal <nrosenthal@chromium.org> -- wpt-commits: b0a91ced1bd21fa0daaf6417b7a87a824a603504 wpt-pr: 48740
47 lines
1.8 KiB
HTML
47 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: observe cross-origin images but without renderTime</title>
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<body>
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<style>
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body {
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margin: 0;
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}
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</style>
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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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async_test((t) => {
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const test_start = performance.now();
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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let img;
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const pathname = 'http://{{domains[www]}}:{{ports[http][1]}}'
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+ '/element-timing/resources/square100.png';
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const observer = new PerformanceObserver(
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t.step_func_done((entryList) => {
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assert_equals(entryList.getEntries().length, 1);
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const entry = entryList.getEntries()[0];
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checkElement(entry, pathname, 'my_image', 'the_id', test_start, img);
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assert_greater_than_equal(entry.renderTime, entry.loadTime,
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'The renderTime of a cross-origin image should be coarse but at least as high as loadTime');
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checkRect(entry, [0, 100, 0, 100]);
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checkNaturalSize(entry, 100, 100);
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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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// TODO(npm): change observer to use buffered flag.
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window.onload = t.step_func(() => {
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// Add a cross origin image resource.
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img = document.createElement('img');
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img.src = pathname;
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img.setAttribute('elementtiming', 'my_image');
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img.setAttribute('id', 'the_id');
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document.body.appendChild(img);
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});
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}, 'Cross-origin image element is NOT observable.');
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</script>
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</body>
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