+ /**
+ * Takes attribute names and values for a tag and the tah name and
+ * validates that the tag is allowed to be present.
+ * This DOES NOT validate the attributes, nor does it validate the
+ * tags themselves. This method only handles the special circumstances
+ * where we may want to allow a tag within content but ONLY when it has
+ * specific attributes set.
+ *
+ * @param $
+ */
+ static function validateTag( $params, $element ) {
+ $params = Sanitizer::decodeTagAttributes( $params );
+
+ if ( $element == 'meta' || $element == 'link' ) {
+ if ( !isset( $params['itemprop'] ) ) {
+ // <meta> and <link> must have an itemprop="" otherwise they are not valid or safe in content
+ return false;
+ }
+ if ( $element == 'meta' && !isset( $params['content'] ) ) {
+ // <meta> must have a content="" for the itemprop
+ return false;
+ }
+ if ( $element == 'link' && !isset( $params['href'] ) ) {
+ // <link> must have an associated href=""
+ return false;
+ }
+ }
+
+ return true;
+ }
+