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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
| commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
| tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /testing/web-platform/tests/layout-instability/buffered-flag.html | |
| parent | Initial commit. (diff) | |
| download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip | |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/layout-instability/buffered-flag.html')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/buffered-flag.html | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/buffered-flag.html b/testing/web-platform/tests/layout-instability/buffered-flag.html new file mode 100644 index 0000000000..a2e91797ce --- /dev/null +++ b/testing/web-platform/tests/layout-instability/buffered-flag.html @@ -0,0 +1,41 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>Layout Instability: PerformanceObserver sees entries with buffered flag</title> +<body> +<style> +#myDiv { position: relative; width: 300px; height: 100px; background: blue; } +</style> +<div id='myDiv'></div> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/util.js"></script> +<script> +promise_test(async t => { + assert_implements(window.LayoutShift, 'Layout Instability is not supported.'); + // Wait for the initial render to complete. + await waitForAnimationFrames(2); + + const startTime = performance.now(); + return new Promise(resolve => { + // First observer creates second in callback to ensure the entry has been dispatched by the time + // the second observer begins observing. + new PerformanceObserver(() => { + const endTime = performance.now(); + // Second observer requires 'buffered: true' to see entries. + new PerformanceObserver(t.step_func(list => { + assert_equals(list.getEntries().length, 1); + const entry = list.getEntries()[0]; + assert_equals(entry.entryType, "layout-shift"); + assert_greater_than_equal(entry.startTime, startTime); + assert_less_than_equal(entry.startTime, endTime); + assert_equals(entry.duration, 0.0); + assert_equals(entry.value, computeExpectedScore(300 * (100 + 60), 60)); + resolve(); + })).observe({'type': 'layout-shift', buffered: true}); + }).observe({type: 'layout-shift'}); + // Modify the position of the div to cause a layout-shift entry. + document.getElementById('myDiv').style = "top: 60px"; + }); +}, 'PerformanceObserver with buffered flag sees previous layout-shift entry.'); +</script> +</body> |