Add invisible class to bundled themes. Props hakre. fixes #9755

git-svn-id: https://develop.svn.wordpress.org/trunk@11277 602fd350-edb4-49c9-b593-d223f7449a82

wp-content/themes/classic/style.css

@@ -12,6 +12,11 @@ This is just a basic layout, with only the bare minimum defined.
 Please tweak this and make it your own. :)
 */
 
+.invisible {
+     position: absolute;
+     left: -1000em;
+}
+
 a {
 	color: #675;
 }

wp-content/themes/default/style.css

@@ -654,6 +654,11 @@ blockquote cite {
 .hidden {
 	display: none;
 	}
+	
+.invisible {
+     position: absolute;
+     left: -1000em;
+}
 
 hr {
 	display: none;