// consistency and better compression.
$element = strtolower( $element );
+ // Some people were abusing this by passing things like
+ // 'h1 id="foo" to $element, which we don't want.
+ if ( strpos( $element, ' ' ) !== false ) {
+ wfWarn( __METHOD__ . " given element name with space '$element'" );
+ }
+
// Remove invalid input types
if ( $element == 'input' ) {
$validTypes = [