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diff --git a/layout/reftests/cssom/computed-style-cross-window-ref.html b/layout/reftests/cssom/computed-style-cross-window-ref.html
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+++ b/layout/reftests/cssom/computed-style-cross-window-ref.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<title>getComputedStyle across windows</title>
+<style>
+p { color: blue }
+
+div { margin: 1em 0 }
+</style>
+
+<script>
+
+var gRunCount = 2;
+
+function run() {
+  if (--gRunCount != 0)
+    return;
+
+  var i = document.getElementById("i");
+
+  var pout = document.getElementById("out");
+  var poutnone = document.getElementById("outnone");
+  var pin = i.contentDocument.getElementsByTagName("p")[0];
+  var pinnone = i.contentDocument.getElementsByTagName("p")[1];
+
+  document.getElementById("res1").style.color =
+    window.getComputedStyle(pin).color;
+
+  document.getElementById("res2").style.color =
+    i.contentWindow.getComputedStyle(pout).color;
+
+  document.getElementById("res3").style.color =
+    window.getComputedStyle(pinnone).color;
+
+  document.getElementById("res4").style.color =
+    i.contentWindow.getComputedStyle(poutnone).color;
+}
+
+</script>
+<body onload="run()">
+
+<p id="out">This is a paragraph outside the iframe.</p>
+<div style="display:none"><p id="outnone">This is a paragraph outside the iframe.</p></div>
+
+<iframe id="i" src="computed-style-cross-window-inner.html" onload="run()"></iframe>
+
+<div style="color:fuchsia">This paragraph is the color that
+outerWindow.getComputedStyle says the paragraph inside the iframe
+is.</div>
+
+<div style="color:blue">This paragraph is the color that
+iframeWindow.getComputedStyle says the paragraph outside the iframe
+is.</div>
+
+<div style="color:fuchsia">This paragraph is the color that
+outerWindow.getComputedStyle says the display:none paragraph inside the
+iframe is.</div>
+
+<div style="color:blue">This paragraph is the color that
+iframeWindow.getComputedStyle says the display:none paragraph outside
+the iframe is.</div>