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diff --git a/dom/tests/mochitest/whatwg/postMessage_structured_clone_helper.html b/dom/tests/mochitest/whatwg/postMessage_structured_clone_helper.html
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+<!DOCTYPE html>
+<html>
+<head>
+ <title>postMessage structured clone page</title>
+ <script type="application/javascript;version=1.7"
+ src="postMessage_structured_clone_helper.js"></script>
+ <script type="application/javascript;version=1.7">
+ var generator = new getTestContent()
+
+ function isClone(a, b) {
+ window.dump("Object a: " + a + "\n");
+ window.dump("Object b: " + b + "\n");
+ var stack = [[a, b]];
+ var memory = new WeakMap();
+ var rmemory = new WeakMap();
+
+ while (stack.length > 0) {
+ var pair = stack.pop();
+ var x = pair[0], y = pair[1];
+ if (typeof x !== "object" || x === null) {
+ // x is primitive.
+ if (x !== y) {
+ window.dump("Primitives not equal!\n");
+ return false;
+ }
+ } else if (x instanceof Date) {
+ if (x.getTime() == y.getTime())
+ return true;
+ window.dump("Dates not equal!\n");
+ return false;
+ } else if (memory.has(x)) {
+ // x is an object we have seen before in a.
+ if (y !== memory.get(x)) {
+ window.dump("Already seen!?\n");
+ return false;
+ }
+ if (!(rmemory.get(y) == x)) {
+ window.dump("Not equal??\n");
+ return false;
+ }
+ } else {
+ // x is an object we have not seen before.
+ // Check that we have not seen y before either.
+ if (rmemory.has(y)) {
+ // If we have seen y before, the only possible outcome
+ // is that x and y are literally the same object.
+ if (y == x)
+ continue;
+ window.dump("Already seen y!?\n");
+ window.dump(y.toString() + "\n");
+ return false;
+ }
+
+ // x and y must be of the same [[Class]].
+ var xcls = Object.prototype.toString.call(x);
+ var ycls = Object.prototype.toString.call(y);
+ if (xcls !== ycls) {
+ window.dump("Failing on proto\n");
+ return false;
+ }
+
+ // This function is only designed to check Objects and Arrays.
+ if (!(xcls === "[object Object]" || xcls === "[object Array]")) {
+ window.dump("Not an object!\n");
+ window.dump(xcls + "\n");
+ return false;
+ }
+
+ // Compare objects.
+ var xk = Object.keys(x), yk = Object.keys(y);
+ if (xk.length !== yk.length) {
+ window.dump("Length mismatch!\n");
+ return false;
+ }
+ for (var i = 0; i < xk.length; i++) {
+ // We must see the same property names in the same order.
+ if (xk[i] !== yk[i]) {
+ window.dump("wrong order\n");
+ return false;
+ }
+
+ // Put the property values on the stack to compare later.
+ stack.push([x[xk[i]], y[yk[i]]]);
+ }
+
+ // Record that we have seen this pair of objects.
+ memory.set(x, y);
+ rmemory.set(y, x);
+ }
+ }
+ return true;
+ }
+
+ function receiveMessage(evt)
+ {
+ if (isClone(evt.data, generator.next()))
+ window.parent.postMessage("TEST-PASS", "*");
+ else
+ window.parent.postMessage("TEST-FAIL", "*");
+ }
+ window.addEventListener("message", receiveMessage, false);
+ </script>
+</head>
+<body>
+</body>
+</html>