Index: src/wp-admin/css/admin-menu.css
===================================================================
--- src/wp-admin/css/admin-menu.css	(revision 58858)
+++ src/wp-admin/css/admin-menu.css	(working copy)
@@ -11,6 +11,9 @@
 	top: 0;
 	bottom: -120px;
 	z-index: 1; /* positive z-index to avoid elastic scrolling woes in Safari */
+
+	/* Only visible in Windows High Contrast mode */
+	outline: 1px solid transparent;
 }
 
 .php-error #adminmenuback {
@@ -205,7 +208,8 @@
 .folded #adminmenu .wp-has-current-submenu .wp-submenu {
 	min-width: 160px;
 	width: auto;
-	border-left: 5px solid transparent;
+	border: 1px solid transparent;
+	border-left-width: 5px;
 }
 
 #adminmenu .wp-submenu li.current,
@@ -415,8 +419,8 @@
 	font-weight: 400;
 	font-size: 14px;
 	padding: 5px 4px 5px 11px;
-	margin: -7px 0 4px -5px;
-	border-width: 3px 0 3px 5px;
+	margin: -8px -1px 4px -5px;
+	border-width: 3px 1px 3px 5px;
 	border-style: solid;
 	border-color: transparent;
 }
@@ -581,8 +585,10 @@
 	}
 
 	.auto-fold #adminmenu .wp-has-current-submenu .wp-submenu {
-		min-width: 150px;
+		min-width: 160px;
 		width: auto;
+		border: 1px solid transparent;
+		border-left-width: 5px;
 	}
 
 	.auto-fold #adminmenu .wp-has-current-submenu li > a {
@@ -771,8 +777,9 @@
 	}
 
 	#adminmenu .wp-not-current-submenu .wp-submenu,
-	.folded #adminmenu .wp-has-current-submenu .wp-submenu {
-		border-left: none;
+	.folded #adminmenu .wp-has-current-submenu .wp-submenu,
+	.auto-fold #adminmenu .wp-has-current-submenu .wp-submenu {
+		border: none;
 	}
 
 	/* Remove submenu headers and adjust sub meu*/
Index: src/wp-includes/css/admin-bar.css
===================================================================
--- src/wp-includes/css/admin-bar.css	(revision 58858)
+++ src/wp-includes/css/admin-bar.css	(working copy)
@@ -97,6 +97,8 @@
 	min-width: 600px; /* match the min-width of the body in wp-admin/css/common.css */
 	z-index: 99999;
 	background: #1d2327;
+	/* Only visible in Windows High Contrast mode */
+	outline: 1px solid transparent;
 }
 
 #wpadminbar .ab-sub-wrapper,
@@ -195,6 +197,8 @@
 #wpadminbar.nojs li:hover > .ab-sub-wrapper,
 #wpadminbar li.hover > .ab-sub-wrapper {
 	display: block;
+	/* Only visible in Windows High Contrast mode */
+	outline: 1px solid transparent;
 }
 
 #wpadminbar .menupop li:hover > .ab-sub-wrapper,
@@ -906,7 +910,7 @@
 	/* New Content */
 	#wpadminbar #wp-admin-bar-new-content .ab-icon:before {
 		top: 0;
-		line-height: 1.33333333;
+		line-height: 1.3;
 		height: 46px !important;
 		text-align: center;
 		width: 52px;