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diff --git a/js/xpconnect/tests/mochitest/test_crosscompartment_weakmap.html b/js/xpconnect/tests/mochitest/test_crosscompartment_weakmap.html
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+++ b/js/xpconnect/tests/mochitest/test_crosscompartment_weakmap.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test Cross-Compartment DOM WeakMaps</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<script type="application/javascript">
+
+var my_map = new WeakMap();
+
+function setup() {
+  var item = window.frames[0].document.querySelector("body");
+
+  my_map.set(item, "success_string");
+
+  var rule_fail = false;
+  try {
+    my_map.set(window.frames[0].document.styleSheets[0].cssRules[0], 1);
+  } catch (e) {
+    rule_fail = true;
+  }
+  ok(rule_fail, "Using rule as a weak map key across compartments should produce an exception because it can't be wrapper preserved.");
+}
+
+function runTest() {
+  setup();
+  SpecialPowers.forceGC();
+  SpecialPowers.forceCC();
+  SpecialPowers.forceGC();
+  SpecialPowers.forceCC();
+  var item = window.frames[0].document.querySelector("body");
+  is(my_map.get(item), "success_string", "Preserve reflectors used cross-compartment as weak map keys.");
+}
+
+</script>
+<iframe src="file_crosscompartment_weakmap.html" onload="runTest()"></iframe>
+
+
+</pre>
+</body>
+</html>