Index: /CKEditor/trunk/_source/plugins/button/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 3699)
+++ /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 3700)
@@ -131,4 +131,5 @@
 				' title="', this.title, '"' +
 				' tabindex="-1"' +
+				' role="button"' +
 				' hidefocus="true"' );