diff --git a/wp-includes/class.wp-scripts.php b/wp-includes/class.wp-scripts.php
index 2cda5a2990..00a782b3ef 100644
--- a/wp-includes/class.wp-scripts.php
+++ b/wp-includes/class.wp-scripts.php
@@ -142,7 +142,7 @@ class WP_Scripts extends WP_Dependencies {
 		$this->init();
 		add_action( 'init', array( $this, 'init' ), 0 );
 
-		if ( ! current_theme_supports( 'html5', 'script' ) ) {
+		if ( ! is_admin() && ! current_theme_supports( 'html5', 'script' ) ) {
 			$this->type_attr = " type='text/javascript'";
 		}
 	}
diff --git a/wp-includes/class.wp-styles.php b/wp-includes/class.wp-styles.php
index ebb9a596f0..3673b9e319 100644
--- a/wp-includes/class.wp-styles.php
+++ b/wp-includes/class.wp-styles.php
@@ -126,7 +126,7 @@ class WP_Styles extends WP_Dependencies {
 		 */
 		do_action_ref_array( 'wp_default_styles', array( &$this ) );
 
-		if ( ! current_theme_supports( 'html5', 'style' ) ) {
+		if ( ! is_admin() && ! current_theme_supports( 'html5', 'style' ) ) {
 			$this->type_attr = " type='text/css'";
 		}
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 429c99de0b..f93871c0a4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46169';
+$wp_version = '5.3-alpha-46170';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.