diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/html-api/class-wp-html-token.php
--- a/wp/wp-includes/html-api/class-wp-html-token.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/html-api/class-wp-html-token.php	Fri Sep 05 18:52:52 2025 +0200
@@ -61,6 +61,24 @@
 	public $has_self_closing_flag = false;
 
 	/**
+	 * Indicates if the element is an HTML element or if it's inside foreign content.
+	 *
+	 * @since 6.7.0
+	 *
+	 * @var string 'html', 'svg', or 'math'.
+	 */
+	public $namespace = 'html';
+
+	/**
+	 * Indicates which kind of integration point the element is, if any.
+	 *
+	 * @since 6.7.0
+	 *
+	 * @var string|null 'math', 'html', or null if not an integration point.
+	 */
+	public $integration_node_type = null;
+
+	/**
 	 * Called when token is garbage-collected or otherwise destroyed.
 	 *
 	 * @var callable|null
@@ -72,13 +90,15 @@
 	 *
 	 * @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.
+	 * @param string|null   $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( $bookmark_name, $node_name, $has_self_closing_flag, $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;
 		$this->has_self_closing_flag = $has_self_closing_flag;
 		$this->on_destroy            = $on_destroy;