Ticket #16118: greuben-16118.diff

wp-includes/class.wp-styles.php

@@ -61 +61 @@
                 $title = isset($this->registered[$handle]->extra['title']) ? "title='" . esc_attr( $this->registered[$handle]->extra['title'] ) . "'" : '';
 
                 $end_cond = $tag = '';
-                if ( isset($this->registered[$handle]->extra['conditional']) && $this->registered[$handle]->extra['conditional'] ) {
-                        $tag .= "<!--[if {$this->registered[$handle]->extra['conditional']}]>\n";
-                        $end_cond = "<![endif]-->\n";
+                if ( isset($this->registered[$handle]->extra['conditional']) && $this->registered[$handle]->extra['conditional'] ) {                    
+                        $tag .= "<!--[if {$this->registered[$handle]->extra['conditional']}]";
+                        if( strpos( $this->registered[$handle]->extra['conditional'], '!' ) === 0 ) {
+                                $tag .= "-->\n";
+                                $end_cond .= "<!--";
+                        } else {
+                                $tag .= ">\n";
+                                $end_cond .= "<!";
+                        }
+                        $end_cond .= "[endif]-->\n";
                 }
 
                 $tag .= apply_filters( 'style_loader_tag', "<link rel='$rel' id='$handle-css' $title href='$href' type='text/css' media='$media' />\n", $handle );