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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/transform-counter-layout-shift.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/transform-counter-layout-shift.html')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/transform-counter-layout-shift.html | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/transform-counter-layout-shift.html b/testing/web-platform/tests/layout-instability/transform-counter-layout-shift.html new file mode 100644 index 0000000000..476e25a532 --- /dev/null +++ b/testing/web-platform/tests/layout-instability/transform-counter-layout-shift.html @@ -0,0 +1,36 @@ +<!DOCTYPE html> +<title>Layout Instability: no layout shift if transform change counters location change</title> +<link rel="help" href="https://wicg.github.io/layout-instability/" /> +<style> +body { margin: 0; } +#transformed { position: relative; transform: translateX(20px); width: 100px; height: 100px; background: blue; } +#child { width: 400px; height: 400px; } +</style> +<div id="transformed"> + <div id="child"></div> +</div> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/util.js"></script> +<script> + +promise_test(async () => { + const watcher = new ScoreWatcher; + + // Wait for the initial render to complete. + await waitForAnimationFrames(2); + + // Modify the transform and the location at the same time, and the values + // cancel each other visually, for which no shift should be reported. + transformed.style.transform = 'translateY(100px)'; + transformed.style.top = '-100px'; + transformed.style.left = '20px'; + // Change size of child, for which no shift should be reported, either. + child.style.width = '300px'; + + await waitForAnimationFrames(2); + // No shift should be reported. + assert_equals(watcher.score, 0); +}, 'no layout shift if transform change counters location change'); + +</script> |