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Diffstat (limited to '')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/translate-change.html | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/translate-change.html b/testing/web-platform/tests/layout-instability/translate-change.html new file mode 100644 index 0000000000..ddfc041700 --- /dev/null +++ b/testing/web-platform/tests/layout-instability/translate-change.html @@ -0,0 +1,33 @@ +<!DOCTYPE html> +<title>Layout Instability: no layout shift for change of individual transform property</title> +<link rel="help" href="https://wicg.github.io/layout-instability/" /> +<style> +body { margin: 0; } +#transformed { position: relative; translate: 20px 0; 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, for which no shift should be reported. + document.querySelector("#transformed").style = "translate: 0 100px"; + // Change size of child, for which no shift should be reported, either. + document.querySelector("#child").style = "width: 300px"; + + await waitForAnimationFrames(2); + // No shift should be reported. + assert_equals(watcher.score, 0); +}, 'no layout shift for transform change'); + +</script> |