diff --git src/wp-includes/class-wp-customize-widgets.php src/wp-includes/class-wp-customize-widgets.php
index 4502e6d..9dac4b1 100644
--- src/wp-includes/class-wp-customize-widgets.php
+++ src/wp-includes/class-wp-customize-widgets.php
@@ -602,8 +602,7 @@ final class WP_Customize_Widgets {
 				( 'Select an area to move this widget into:' ), // @todo translate
 				esc_html_x( 'Move', 'move widget' ),
 			),
-			'
-				<div class="move-widget-area">
+			'<div class="move-widget-area">
 					<p class="description">{description}</p>
 					<ul class="widget-area-select">
 						<% _.each( sidebars, function ( sidebar ){ %>
@@ -613,8 +612,7 @@ final class WP_Customize_Widgets {
 					<div class="move-widget-actions">
 						<button class="move-widget-btn button-secondary" type="button">{btn}</button>
 					</div>
-				</div>
-			'
+			</div>'
 		);
 
 		/*