Ticket #56228: 56228.3.diff

src/wp-admin/css/common.css

@@ -573 +573 @@
         margin: 10px 20px 0 2px;
 }
 
-.wrap.block-editor-no-js {
+.wrap.block-editor-no-js,
+.wrap.site-editor-no-js {
         padding-left: 20px;
 }
 

src/wp-admin/site-editor.php

@@ -132 +132 @@
 require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
-<div id="site-editor" class="edit-site"></div>
+<div class="edit-site">
+        <div id="site-editor"></div>
 
+        <?php // JavaScript is disabled. ?>
+        <div class="wrap hide-if-js site-editor-no-js">
+                <h1 class="wp-heading-inline"><?php _e( 'Edit site' ); ?></h1>
+                <div class="notice notice-error notice-alt">
+                        <p>
+                                <?php
+                                        /**
+                                         * Filters the message displayed in the site editor interface when JavaScript is
+                                         * not enabled in the browser.
+                                         *
+                                         * @since 6.3.0
+                                         *
+                                         * @param string  $message The message being displayed.
+                                         * @param WP_Post $post    The post being edited.
+                                         */
+                                        echo apply_filters( 'site_editor_no_javascript_message', __( 'The site editor requires JavaScript. Please enable JavaScript in your browser settings.' ), $post );
+                                ?>
+                        </p>
+                </div>
+        </div>
+</div>
+
 <?php
 
 require_once ABSPATH . 'wp-admin/admin-footer.php';