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diff --git a/testing/web-platform/tests/layout-instability/shift-into-viewport-inline-direction.html b/testing/web-platform/tests/layout-instability/shift-into-viewport-inline-direction.html
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+++ b/testing/web-platform/tests/layout-instability/shift-into-viewport-inline-direction.html
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+<!DOCTYPE html>
+<title>Layout Instability: shift into viewport in inline direction</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+#j { position: absolute; width: 200px; height: 600px; left: -200px; background: blue; }
+</style>
+<div id='j'></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);
+
+ // Move div into viewport horizontally.
+ document.querySelector("#j").style.left = '100px';
+
+ await waitForAnimationFrames(3);
+ assert_equals(watcher.score, 0);
+}, "Shift into viewport in inline direction.");
+
+</script>
+