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Diffstat (limited to '')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/absolute-child-shift-with-parent-will-change.html | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/absolute-child-shift-with-parent-will-change.html b/testing/web-platform/tests/layout-instability/absolute-child-shift-with-parent-will-change.html new file mode 100644 index 0000000000..1597f10892 --- /dev/null +++ b/testing/web-platform/tests/layout-instability/absolute-child-shift-with-parent-will-change.html @@ -0,0 +1,31 @@ +<!DOCTYPE html> +<title>Layout Instability: parent and overflowing absolute child moved together</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 id="parent" style="position: relative; width: 100px; height: 100px; background: yellow; will-change: transform"> + <div id="child" style="position: absolute; top: 300px; left: 400px; width: 100px; height: 100px; background: blue"></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 parent = document.querySelector("#parent"); + parent.style.top = '100px'; + + // We should track parent and child separately. + const expectedScore = computeExpectedScore(100 * (100 + 100), 100) * 2; + + // Observer fires after the frame is painted. + assert_equals(watcher.score, 0); + await watcher.promise; + assert_equals(watcher.score, expectedScore); +}, 'Parent and overflowing absolute child movement.'); + +</script> |