Index: /CKEditor/trunk/_source/plugins/listblock/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/listblock/plugin.js	(revision 7366)
+++ /CKEditor/trunk/_source/plugins/listblock/plugin.js	(revision 7367)
@@ -101,6 +101,5 @@
 									( CKEDITOR.env.ie ? 'onclick="return false;" onmouseup' : 'onclick' ) +		// #188
 										'="CKEDITOR.tools.callFunction(', this._.getClick(), ',\'', value, '\'); return false;"',
-									' role="option"' +
-									' aria-posinset="' + ++this._.size + '">',
+									' role="option">',
 									html || value,
 								'</a>' +
@@ -123,9 +122,4 @@
 						this._.close();
 						this.element.appendHtml( this._.pendingHtml.join( '' ) );
-
-						var items = this._.items,
-							doc = this.element.getDocument();
-						for ( var value in items )
-							doc.getById( items[ value ] + '_option' ).setAttribute( 'aria-setsize', this._.size );
 						delete this._.size;