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diff --git a/wp-includes/html-api/class-wp-html-token.php b/wp-includes/html-api/class-wp-html-token.php
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+<?php
+/**
+ * HTML API: WP_HTML_Token class
+ *
+ * @package WordPress
+ * @subpackage HTML-API
+ * @since 6.4.0
+ */
+
+/**
+ * Core class used by the HTML processor during HTML parsing
+ * for referring to tokens in the input HTML string.
+ *
+ * This class is designed for internal use by the HTML processor.
+ *
+ * @since 6.4.0
+ *
+ * @access private
+ *
+ * @see WP_HTML_Processor
+ */
+class WP_HTML_Token {
+	/**
+	 * Name of bookmark corresponding to source of token in input HTML string.
+	 *
+	 * Having a bookmark name does not imply that the token still exists. It
+	 * may be that the source token and underlying bookmark was wiped out by
+	 * some modification to the source HTML.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @var string
+	 */
+	public $bookmark_name = null;
+
+	/**
+	 * Name of node; lowercase names such as "marker" are not HTML elements.
+	 *
+	 * For HTML elements/tags this value should come from WP_HTML_Processor::get_tag().
+	 *
+	 * @since 6.4.0
+	 *
+	 * @see WP_HTML_Processor::get_tag()
+	 *
+	 * @var string
+	 */
+	public $node_name = null;
+
+	/**
+	 * Whether node contains the self-closing flag.
+	 *
+	 * A node may have a self-closing flag when it shouldn't. This value
+	 * only reports if the flag is present in the original HTML.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @see https://html.spec.whatwg.org/#self-closing-flag
+	 *
+	 * @var bool
+	 */
+	public $has_self_closing_flag = false;
+
+	/**
+	 * Called when token is garbage-collected or otherwise destroyed.
+	 *
+	 * @var callable|null
+	 */
+	public $on_destroy = null;
+
+	/**
+	 * Constructor - creates a reference to a token in some external HTML string.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param string   $bookmark_name         Name of bookmark corresponding to location in HTML where token is found.
+	 * @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 $on_destroy            Function to call when destroying token, useful for releasing the bookmark.
+	 */
+	public function __construct( $bookmark_name, $node_name, $has_self_closing_flag, $on_destroy = null ) {
+		$this->bookmark_name         = $bookmark_name;
+		$this->node_name             = $node_name;
+		$this->has_self_closing_flag = $has_self_closing_flag;
+		$this->on_destroy            = $on_destroy;
+	}
+
+	/**
+	 * Destructor.
+	 *
+	 * @since 6.4.0
+	 */
+	public function __destruct() {
+		if ( is_callable( $this->on_destroy ) ) {
+			call_user_func( $this->on_destroy, $this->bookmark_name );
+		}
+	}
+
+	/**
+	 * Wakeup magic method.
+	 *
+	 * @since 6.4.2
+	 */
+	public function __wakeup() {
+		throw new \LogicException( __CLASS__ . ' should never be unserialized' );
+	}
+}