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diff --git a/testing/web-platform/tests/css/css-position/position-fixed-scroll-nested-fixed.html b/testing/web-platform/tests/css/css-position/position-fixed-scroll-nested-fixed.html
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+++ b/testing/web-platform/tests/css/css-position/position-fixed-scroll-nested-fixed.html
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+<!DOCTYPE html>
+<title>CSS Position: Nested position:fixed in a scrollable position:fixed</title>
+<link rel="help" href="https://www.w3.org/TR/css-position-3/#fixed-position">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=956203">
+<link rel="match" href="position-fixed-scroll-nested-fixed-ref.html">
+<meta name="assert" content="The nested position:fixed element should be above its parent, as if it was a sibling.">
+<div id="outer" style="position: fixed; width: 100px; height: 100px; overflow: auto; background: red">
+ <div style="position: fixed; width: 200px; height: 100px; background: green"></div>
+ <div style="height: 500px"></div>
+</div>
+<div style="height: 5000px"></div>
+<script>
+outer.scrollTop = 200;
+</script>