- Patch #718922 by derjochenmeyer, betz, mgifford, JohnAlbin, casey:...

- Patch #718922 by derjochenmeyer, betz, mgifford, JohnAlbin, casey: .element-invisible does not work with VoiceOver on OS X Snow Leopard.

modules/system/system-behavior.css

@@ -302,10 +302,11 @@ html.js .js-hide {
  * the site where visual display is undesirable. Information provided in this
  * manner should be kept concise, to avoid unnecessary burden on the user. Must
  * not be used for focusable elements (such as links and form elements) as this
- * causes issues for keyboard only or voice recognition users.
+ * causes issues for keyboard only or voice recognition users. "!important" is
+ * used to prevent unintentional overrides.
  */
 .element-invisible {
-  height: 0;
-  overflow: hidden;
-  position: absolute;
+  position: absolute !important;
+  clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
+  clip: rect(1px, 1px, 1px, 1px);
 }