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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
| commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
| tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /testing/web-platform/tests/layout-instability/buffer-layout-shift.html | |
| parent | Initial commit. (diff) | |
| download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip | |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/layout-instability/buffer-layout-shift.html')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/buffer-layout-shift.html | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/buffer-layout-shift.html b/testing/web-platform/tests/layout-instability/buffer-layout-shift.html new file mode 100644 index 0000000000..1db0452497 --- /dev/null +++ b/testing/web-platform/tests/layout-instability/buffer-layout-shift.html @@ -0,0 +1,45 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>Layout Instability entries are not available via the performance timeline</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 => { + new PerformanceObserver(t.step_func(list => { + const endTime = performance.now(); + assert_equals(list.getEntries().length, 1); + const entry = list.getEntries()[0]; + assert_equals(entry.entryType, "layout-shift"); + assert_equals(entry.name, ""); + assert_greater_than_equal(entry.startTime, startTime); + assert_less_than_equal(entry.startTime, endTime); + assert_equals(entry.duration, 0.0); + // The layout shift value should be: + // 300 * (100 + 60) * (60 / maxDimension) / viewport size. + assert_equals(entry.value, computeExpectedScore(300 * (100 + 60), 60)); + + // The entry should not be available via getEntries* methods. + assert_equals(performance.getEntriesByType('layout-shift').length, 0, 'getEntriesByType should have no layout-shift entries'); + assert_equals(performance.getEntriesByName('', 'layout-shift').length, 0, 'getEntriesByName should have no layout-shift entries'); + assert_equals(performance.getEntries().filter(e => e.entryType === 'layout-shift').length, 0, 'getEntries should have no layout-shift entries'); + resolve(); + })).observe({type: 'layout-shift'}); + // Modify the position of the div. + document.getElementById('myDiv').style = "top: 60px"; + }); +}, 'Layout shift before onload is not buffered into the performance timeline.'); +</script> + +</body> |