1 files changed, 19 insertions, 0 deletions
diff --git a/layout/base/crashtests/429088-1.html b/layout/base/crashtests/429088-1.html
new file mode 100644
index 0000000000..badda71d8e
--- /dev/null
+++ b/layout/base/crashtests/429088-1.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script type="text/javascript">
+
+function boom()
+{
+  window.addEventListener("DOMSubtreeModified", function(){});
+
+  var MATHML_NS = "http://www.w3.org/1998/Math/MathML";
+  var ms = document.createElementNS(MATHML_NS, "ms");
+  document.body.appendChild(ms);
+}
+
+</script>
+</head>
+
+<body onload="boom();"></body>
+</html>