diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/block-editor.php
--- a/wp/wp-includes/block-editor.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/block-editor.php	Fri Sep 05 18:52:52 2025 +0200
@@ -223,6 +223,7 @@
 		'imageEditing'                     => true,
 		'imageSizes'                       => $available_image_sizes,
 		'maxUploadFileSize'                => $max_upload_size,
+		'__experimentalDashboardLink'      => admin_url( '/' ),
 		// The following flag is required to enable the new Gallery block format on the mobile apps in 5.9.
 		'__unstableGalleryWithImageBlocks' => true,
 	);
@@ -366,6 +367,7 @@
 	ob_start();
 	wp_print_styles();
 	wp_print_font_faces();
+	wp_print_font_faces_from_style_variations();
 	$styles = ob_get_clean();
 
 	if ( $has_emoji_styles ) {
@@ -532,7 +534,7 @@
 		 * entered by users does not break other global styles.
 		 */
 		$global_styles[] = array(
-			'css'            => wp_get_global_styles_custom_css(),
+			'css'            => wp_get_global_stylesheet( array( 'custom-css' ) ),
 			'__unstableType' => 'user',
 			'isGlobalStyles' => true,
 		);
@@ -648,6 +650,8 @@
 		$editor_settings['postContentAttributes'] = $post_content_block_attributes;
 	}
 
+	$editor_settings['canUpdateBlockBindings'] = current_user_can( 'edit_block_binding', $block_editor_context );
+
 	/**
 	 * Filters the settings to pass to the block editor for all editor type.
 	 *
@@ -852,3 +856,21 @@
 
 	return $theme_settings;
 }
+
+/**
+ * Initialize site preview.
+ *
+ * This function sets IFRAME_REQUEST to true if the site preview parameter is set.
+ *
+ * @since 6.8.0
+ */
+function wp_initialize_site_preview_hooks() {
+	if (
+		! defined( 'IFRAME_REQUEST' ) &&
+		isset( $_GET['wp_site_preview'] ) &&
+		1 === (int) $_GET['wp_site_preview'] &&
+		current_user_can( 'edit_theme_options' )
+	) {
+		define( 'IFRAME_REQUEST', true );
+	}
+}