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+++ b/testing/web-platform/tests/css/css-will-change/will-change-fixpos-cb-webkit-perspective-1.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS will-change: 'will-change: -webkit-perspective' creates a containing block for fixed positioned elements</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="author" title="Google" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
+<link rel="help" href="http://www.w3.org/TR/css3-transforms/#perspective-property">
+<link rel="help" href="https://compat.spec.whatwg.org/#css-simple-aliases">
+<link rel="match" href="green-square-100-by-100-offset-ref.html">
+<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
+<style>
+html, body { margin: 0; padding: 0; }
+div { width: 100px; height: 100px }
+#wc { will-change: -webkit-perspective; margin: 100px 0 0 100px; background: red }
+.child { top: 0; left: 0; width: 50px; background: green }
+#fixpos { position: fixed }
+#abspos { position: absolute; left: 50px }
+</style>
+<body>
+  <div id="wc">
+    <div class="child" id="fixpos">
+    </div>
+    <div class="child" id="abspos">
+    </div>
+  </div>
+</body>