Consolidated patch for retina support, props taylorde, props empireoflight, fixes #21019

git-svn-id: http://core.svn.wordpress.org/trunk@22031 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/css/wp-pointer.css

@@ -185,3 +185,19 @@
 .rtl .wp-pointer-undefined .wp-pointer-arrow {
 	right: 50px;
 }
+
+/**
+ * HiDPI Displays
+ */
+@media only screen and (-webkit-min-device-pixel-ratio: 1.5) {
+
+	.wp-pointer-buttons a.close:before {
+		background-image: url('../images/xit-2x.gif');
+		background-size: 20px auto;
+	}
+
+	.wp-pointer-content h3:before {
+		background-image: url('../images/icon-pointer-flag.png');
+		background-size: 36px auto;
+	}
+}