Ensure we get bookmark_name on tokens

Author: sirreal

src/wp-includes/html-api/class-wp-html-token.php

@@ -31,7 +31,7 @@ class WP_HTML_Token {
 	 *
 	 * @var string
 	 */
-	public $bookmark_name = null;
+	public $bookmark_name;
 
 	/**
 	 * Name of node; lowercase names such as "marker" are not HTML elements.
@@ -90,13 +90,13 @@ class WP_HTML_Token {
 	 *
 	 * @since 6.4.0
 	 *
-	 * @param string|null   $bookmark_name         Name of bookmark corresponding to location in HTML where token is found,
+	 * @param string        $bookmark_name         Name of bookmark corresponding to location in HTML where token is found,
 	 *                                             or `null` for markers and nodes without a bookmark.
 	 * @param string        $node_name             Name of node token represents; if uppercase, an HTML element; if lowercase, a special value like "marker".
 	 * @param bool          $has_self_closing_flag Whether the source token contains the self-closing flag, regardless of whether it's valid.
 	 * @param callable|null $on_destroy            Optional. Function to call when destroying token, useful for releasing the bookmark.
 	 */
-	public function __construct( ?string $bookmark_name, string $node_name, bool $has_self_closing_flag, ?callable $on_destroy = null ) {
+	public function __construct( string $bookmark_name, string $node_name, bool $has_self_closing_flag, ?callable $on_destroy = null ) {
 		$this->bookmark_name         = $bookmark_name;
 		$this->namespace             = 'html';
 		$this->node_name             = $node_name;