diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index 9b127c5195..2477843ad1 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -3178,7 +3178,9 @@ img {
 	font-size: 13px;
 	width: 97%;
 	background: #f9f9f9;
-	outline: none;
+	-moz-tab-size: 4;
+	-o-tab-size: 4;
+	tab-size: 4;
 }
 
 /* rtl:ignore */