diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-admin/menu-header.php
--- a/wp/wp-admin/menu-header.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-admin/menu-header.php	Fri Sep 05 18:52:52 2025 +0200
@@ -6,6 +6,11 @@
  * @subpackage Administration
  */
 
+// Don't load directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	die( '-1' );
+}
+
 /**
  * The current page.
  *
@@ -137,7 +142,6 @@
 				$img_class = ' dashicons-before ' . sanitize_html_class( $item[6] );
 			}
 		}
-		$arrow = '<div class="wp-menu-arrow"><div></div></div>';
 
 		$title = wptexturize( $item[0] );
 
@@ -166,9 +170,9 @@
 					&& ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) )
 			) {
 				$admin_is_parent = true;
-				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
 			} else {
-				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
 			}
 		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
 			$menu_hook = get_plugin_page_hook( $item[2], 'admin.php' );
@@ -185,9 +189,9 @@
 					&& ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) )
 			) {
 				$admin_is_parent = true;
-				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			} else {
-				echo "\n\t<a href='{$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='{$item[2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			}
 		}
 
@@ -278,9 +282,9 @@
 	}
 
 	echo '<li id="collapse-menu" class="hide-if-no-js">' .
-		'<button type="button" id="collapse-button" aria-label="' . esc_attr__( 'Collapse Main menu' ) . '" aria-expanded="true">' .
+		'<button type="button" id="collapse-button" aria-label="' . esc_attr__( 'Collapse Main Menu' ) . '" aria-expanded="true">' .
 		'<span class="collapse-button-icon" aria-hidden="true"></span>' .
-		'<span class="collapse-button-label">' . __( 'Collapse menu' ) . '</span>' .
+		'<span class="collapse-button-label">' . __( 'Collapse Menu' ) . '</span>' .
 		'</button></li>';
 }