Pseudo-elements should start with double colons

Author: philwareham

dist/textpattern/jquery-ui.css

@@ -41,7 +41,7 @@
 /**
  * Clearfix jQuery UI elements.
  */
-.ui-helper-clearfix:after {
+.ui-helper-clearfix::after {
   display: table;
   clear: both;
   border-collapse: collapse;