Return empty array getting attributes on </br>

Author: sirreal

src/wp-includes/html-api/class-wp-html-tag-processor.php

@@ -2828,7 +2828,7 @@ public function get_attribute( $name ) {
 	public function get_attribute_names_with_prefix( $prefix ): ?array {
 		if (
 			self::STATE_MATCHED_TAG !== $this->parser_state ||
-			$this->is_closing_tag
+			$this->is_tag_closer()
 		) {
 			return null;
 		}