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Diffstat (limited to '')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/sticky-descendant-move.html | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/sticky-descendant-move.html b/testing/web-platform/tests/layout-instability/sticky-descendant-move.html new file mode 100644 index 0000000000..afab89592d --- /dev/null +++ b/testing/web-platform/tests/layout-instability/sticky-descendant-move.html @@ -0,0 +1,29 @@ +<!DOCTYPE html> +<title>Layout Instability: movement of descendant of sticky positioned</title> +<link rel="help" href="https://wicg.github.io/layout-instability/" /> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/util.js"></script> +<div style="position: sticky; width: 400px; height: 300px; top: 0"> + <div id="child" style="position: relative; width: 300px; height: 200px; background: yellow"></div> +</div> +<script> +promise_test(async () => { + const watcher = new ScoreWatcher; + + // Wait for the initial render to complete. + await waitForAnimationFrames(2); + + // Modify the position of the div. + const child = document.querySelector("#child"); + child.style.top = '100px'; + + const expectedScore = computeExpectedScore(300 * (200 + 100), 100); + + // Observer fires after the frame is painted. + assert_equals(watcher.score, 0); + await watcher.promise; + assert_equals(watcher.score, expectedScore); +}, 'Movement of descendant of sticky positioned.'); + +</script> |