diff --git a/src/wp-includes/html-api/class-wp-html-processor.php b/src/wp-includes/html-api/class-wp-html-processor.php
index b2a597b938495..401b322446fae 100644
--- a/src/wp-includes/html-api/class-wp-html-processor.php
+++ b/src/wp-includes/html-api/class-wp-html-processor.php
@@ -5431,14 +5431,30 @@ public function has_class( $wanted_class ): ?bool {
 	 *
 	 * This generator function is designed to be used inside a "foreach" loop.
 	 *
-	 * Example:
-	 *
-	 *     $p = WP_HTML_Processor::create_fragment( "<div class='free &lt;egg&lt;\tlang-en'>" );
-	 *     $p->next_tag();
-	 *     foreach ( $p->class_list() as $class_name ) {
-	 *         echo "{$class_name} ";
-	 *     }
-	 *     // Outputs: "free <egg> lang-en "
+	 * ```php
+	 * <?php
+	 * echo 'not really a demo';
+	 * ```
+	 *
+	 * ```php interactive
+	 * <?php
+	 * echo 'really a demo';
+	 * ```
+	 *
+	 * ```php interactive
+	 * <?php
+	 * require '/wordpress/wp-load.php';
+	 * $p = WP_HTML_Processor::create_fragment( "<div class='free &lt;egg&gt;\tlang-en'>" );
+	 * $p->next_tag();
+	 * foreach ( $p->class_list() as $class_name ) {
+	 *   var_dump( $class_name );
+	 * }
+	 * ```
+	 * ```expected-output
+	 * string(4) "free"
+	 * string(5) "<egg>"
+	 * string(7) "lang-en"
+	 * ```
 	 *
 	 * @since 6.6.0 Subclassed for the HTML Processor.
 	 */