diff -r 000000000000 -r 6474c204b198 layout/reftests/bugs/386310-script.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/reftests/bugs/386310-script.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function wrapNode() {
+  var elm = document.getElementById("test");
+  var span = document.createElement("span");
+  span.setAttribute("style", "background: yellow");
+  var range = document.createRange();
+  var start = "first second third [".length;
+  range.setStart(elm.lastChild, start);
+  range.setEnd(elm.lastChild, start + "fourth".length);
+  range.surroundContents(span);
+}
+
+window.addEventListener("load", wrapNode, false);