CSS: Rewrote .ui-helper-hidden-accessible base on HTML5 Boilerplate. Fixes #4623 - CSS: ui-helper-hidden-accessible affects page layout.

Author: scottgonzalez

themes/base/jquery.ui.core.css

@@ -11,7 +11,7 @@
 /* Layout helpers
 ----------------------------------*/
 .ui-helper-hidden { display: none; }
-.ui-helper-hidden-accessible { position: absolute; left: -99999999px; }
+.ui-helper-hidden-accessible { position: absolute !important; clip: rect(1px 1px 1px 1px); clip: rect(1px,1px,1px,1px); }
 .ui-helper-reset { margin: 0; padding: 0; border: 0; outline: 0; line-height: 1.3; text-decoration: none; font-size: 100%; list-style: none; }
 .ui-helper-clearfix:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; }
 .ui-helper-clearfix { display: inline-block; }