Index: wp-includes/css/admin-bar.dev.css
===================================================================
--- wp-includes/css/admin-bar.dev.css	(revision 17693)
+++ wp-includes/css/admin-bar.dev.css	(working copy)
@@ -29,9 +29,13 @@
 
 #wpadminbar {
 	direction: ltr;
-	background-color: #777;
-	background-image: -moz-linear-gradient(bottom,  #666,  #7f7f7f);
-	background-image: -webkit-gradient(linear, left bottom, left top, from(#666), to(#7f7f7f));
+	background: #777; /* Fallback */
+	background-image: -ms-linear-gradient(bottom, #666, #7f7f7f); /* IE10 */ 
+	background-image: -moz-linear-gradient(bottom, #666, #7f7f7f); /* Firefox */ 
+	background-image: -o-linear-gradient(bottom, #666, #7f7f7f); /* Opera */ 
+	background-image: -webkit-gradient(linear, left bottom, left top, from(#666), to(#7f7f7f)); /* old Webkit */ 
+	background-image: -webkit-linear-gradient(bottom, #666, #7f7f7f); /* new Webkit */ 
+	background-image: linear-gradient(bottom, #666, #7f7f7f); /* proposed W3C Markup */
 	color: #ddd;
 	font: normal 12px/28px Arial, Helvetica, sans-serif;
 	height: 28px;
@@ -139,15 +143,23 @@
 
 #wpadminbar .quicklinks li:hover,
 #wpadminbar .quicklinks .selected {
-	background: #555;
-	background: -moz-linear-gradient(bottom,  #555,  #3e3e3e);
-	background: -webkit-gradient(linear, left bottom, left top, from(#555), to(#3e3e3e));
+	background: #555; /* Fallback */
+	background-image: -ms-linear-gradient(bottom, #555, #3e3e3e); /* IE10 */ 
+	background-image: -moz-linear-gradient(bottom, #555, #3e3e3e); /* Firefox */ 
+	background-image: -o-linear-gradient(bottom, #555, #3e3e3e); /* Opera */ 
+	background-image: -webkit-gradient(linear, left bottom, left top, from(#555), to(#3e3e3e)); /* old Webkit */ 
+	background-image: -webkit-linear-gradient(bottom, #555, #3e3e3e); /* new Webkit */ 
+	background-image: linear-gradient(bottom, #555, #3e3e3e); /* proposed W3C Markup */
 }
 
 #wpadminbar .quicklinks .menupop li:hover {
-	background: #888;
-	background: -moz-linear-gradient(bottom,  #888,  #9d9d9d);
-	background: -webkit-gradient(linear, left bottom, left top, from(#888), to(#9d9d9d));
+	background: #888; /* Fallback */
+	background-image: -ms-linear-gradient(bottom, #888, #9d9d9d); /* IE10 */ 
+	background-image: -moz-linear-gradient(bottom, #888, #9d9d9d); /* Firefox */ 
+	background-image: -o-linear-gradient(bottom, #888, #9d9d9d); /* Opera */ 
+	background-image: -webkit-gradient(linear, left bottom, left top, from(#888), to(#9d9d9d)); /* old Webkit */ 
+	background-image: -webkit-linear-gradient(bottom, #888, #9d9d9d); /* new Webkit */ 
+	background-image: linear-gradient(bottom, #888, #9d9d9d); /* proposed W3C Markup */
 }
 
 #wpadminbar .quicklinks .menupop a > span {
@@ -178,7 +190,7 @@
 }
 
 #wpadminbar .quicklinks a:hover span#ab-awaiting-mod,
-#wpadminbar .quicklinks a:hover span#ab-updates  {
+#wpadminbar .quicklinks a:hover span#ab-updates {
 	background: #fff;
 	color: #000;
 }
@@ -256,9 +268,13 @@
 	text-shadow: 0px 1px 0px #eee;
 	cursor: pointer;
 	float: left;
-	background: #aaa;
-	background: -moz-linear-gradient(bottom,  #aaa,  #cecece);
-	background: -webkit-gradient(linear, left bottom, left top, from(#aaa), to(#cecece));
+	background: #aaa; /* Fallback */
+	background-image: -ms-linear-gradient(bottom, #aaa, #cecece); /* IE10 */ 
+	background-image: -moz-linear-gradient(bottom, #aaa, #cecece); /* Firefox */ 
+	background-image: -o-linear-gradient(bottom, #aaa, #cecece); /* Opera */ 
+	background-image: -webkit-gradient(linear, left bottom, left top, from(#aaa), to(#cecece)); /* old Webkit */ 
+	background-image: -webkit-linear-gradient(bottom, #aaa, #cecece); /* new Webkit */ 
+	background-image: linear-gradient(bottom, #aaa, #cecece); /* proposed W3C Markup */
 	-webkit-border-radius: 10px;
 	-khtml-border-radius: 10px;
 	-moz-border-radius: 10px;
@@ -271,9 +287,13 @@
 }
 
 #wpadminbar #adminbarsearch .adminbar-button:active {
-	background: #a0a0a0;
-	background:-moz-linear-gradient(bottom,  #a0a0a0,  #c1c1c1);
-	background:-webkit-gradient(linear, left bottom, left top, from(#a0a0a0), to(#c1c1c1));
+	background: #a0a0a0; /* Fallback */
+	background-image: -ms-linear-gradient(bottom, #a0a0a0, #c1c1c1); /* IE10 */ 
+	background-image: -moz-linear-gradient(bottom, #a0a0a0, #c1c1c1); /* Firefox */ 
+	background-image: -o-linear-gradient(bottom, #a0a0a0, #c1c1c1); /* Opera */ 
+	background-image: -webkit-gradient(linear, left bottom, left top, from(#a0a0a0), to(#c1c1c1)); /* old Webkit */ 
+	background-image: -webkit-linear-gradient(bottom, #a0a0a0, #c1c1c1); /* new Webkit */ 
+	background-image: linear-gradient(bottom, #a0a0a0, #c1c1c1); /* proposed W3C Markup */
 	-moz-box-shadow: inset 1px 1px 1px #9b9b9b;
 	-webkit-box-shadow: inset 1px 1px 1px #9b9b9b;
 	box-shadow: inset 1px 1px 1px #9b9b9b;