diff --git a/mozilla/layout/style/crashtests/404470-1.html b/mozilla/layout/style/crashtests/404470-1.html
new file mode 100644
index 00000000000..481ba4233b0
--- /dev/null
+++ b/mozilla/layout/style/crashtests/404470-1.html
@@ -0,0 +1,15 @@
+<html>
+<head>
+<script>
+
+function boom()
+{
+  var iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  iframe.setAttribute("src", 'data:application/vnd.mozilla.xul+xml,<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"><script>window.parent.document.body.style.display="inline"; window.parent.document.body.offsetWidth;</' + 'script></window>');
+}
+</script>
+</head>
+
+<body onload="boom();"></body>
+</html>
diff --git a/mozilla/layout/style/crashtests/crashtests.list b/mozilla/layout/style/crashtests/crashtests.list
index 4a83b823aaa..cb1244538d2 100644
--- a/mozilla/layout/style/crashtests/crashtests.list
+++ b/mozilla/layout/style/crashtests/crashtests.list
@@ -7,4 +7,5 @@ load 383979-2.html
 load 391034-1.xhtml
 load 397022-1.html
 load 399289-1.svg
+load 404470-1.html
 load 411603-1.html
