MDL-16668 import htmlpurifier 3.1.1 to HEAD

lib/htmlpurifier/HTMLPurifier/AttrDef/CSS.php

@@ -29,6 +29,12 @@ class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
         $declarations = explode(';', $css);
         $propvalues = array();
         
+        /**
+         * Name of the current CSS property being validated.
+         */
+        $property = false;
+        $context->register('CurrentCSSProperty', $property);
+        
         foreach ($declarations as $declaration) {
             if (!$declaration) continue;
             if (!strpos($declaration, ':')) continue;
@@ -61,6 +67,8 @@ class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
             $propvalues[$property] = $result;
         }
         
+        $context->destroy('CurrentCSSProperty');
+        
         // procedure does not write the new CSS simultaneously, so it's
         // slightly inefficient, but it's the only way of getting rid of
         // duplicates. Perhaps config to optimize it, but not now.