Index: wp-includes/css/buttons.css
===================================================================
--- wp-includes/css/buttons.css	(revision 26908)
+++ wp-includes/css/buttons.css	(working copy)
@@ -179,6 +179,7 @@
 	box-shadow:         none !important;
 	text-shadow: 0 1px 0 #fff !important;
 	cursor: default;
+        pointer-events: none;
 }
 
 /* ----------------------------------------------------------------------------