diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 8905721c79..440a53712c 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -4128,6 +4128,9 @@ final class WP_Customize_Manager {
 			'type'     => 'textarea',
 			'section'  => 'custom_css',
 			'settings' => array( 'default' => $custom_css_setting->id ),
+			'input_attrs' => array(
+				'class' => 'code', // Ensures contents displayed as LTR instead of RTL.
+			),
 		) );
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 14db0332c3..8c8114060b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-RC2-39498';
+$wp_version = '4.7-RC2-39500';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.