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diff --git a/testing/web-platform/tests/layout-instability/transform-above-perspective-dynamic.html b/testing/web-platform/tests/layout-instability/transform-above-perspective-dynamic.html
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+++ b/testing/web-platform/tests/layout-instability/transform-above-perspective-dynamic.html
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+<!DOCTYPE html>
+<title>Layout Instability: addition of transform above perspective</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<div id=target2>
+ <div id=perspective style="perspective: 1000px;">
+ <div id=target>Test</div>
+ </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);
+
+ target2.style.transform = 'translateX(0px)';
+ await waitForAnimationFrames(1);
+
+ assert_equals(watcher.score, 0);
+}, 'addition of transform above perspective');
+
+</script>