Index: /trunk/src/wp-admin/css/revisions.css
===================================================================
--- /trunk/src/wp-admin/css/revisions.css	(revision 63502)
+++ /trunk/src/wp-admin/css/revisions.css	(revision 63503)
@@ -1,5 +1,2 @@
-/*------------------------------------------------------------------------------
-  11.2 - Post Revisions
-------------------------------------------------------------------------------*/
 .revisions-control-frame,
 .revisions-diff-frame {
@@ -76,7 +73,7 @@
 	opacity: 0;
 	width: 100%;
-	width: calc( 100% - 30px );
+	width: calc(100% - 30px);
 	top: 50%;
-	top: calc( 50% - 10px );
+	top: calc(50% - 10px);
 	transition: opacity 0.5s;
 }
@@ -384,8 +381,4 @@
 }
 
-.revisions-tooltip {
-	display: none;
-}
-
 .arrow {
 	width: 70px;
@@ -399,20 +392,5 @@
 }
 
-.arrow:after {
-	z-index: 9999;
-	background-color: #fff;
-	box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
-}
-
-.arrow.top {
-	top: -16px;
-	bottom: auto;
-}
-
-.arrow.left {
-	left: 20%;
-}
-
-.arrow:after {
+.arrow::after {
 	content: "";
 	position: absolute;
@@ -422,8 +400,20 @@
 	height: 25px;
 	transform: rotate(45deg);
+	z-index: 9999;
+	background-color: #fff;
+	box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
+}
+
+.arrow.top {
+	top: -16px;
+	bottom: auto;
+}
+
+.arrow.left {
+	left: 20%;
 }
 
 .revisions-tooltip,
-.revisions-tooltip-arrow:after {
+.revisions-tooltip-arrow::after {
 	border-width: 1px;
 	border-style: solid;
@@ -456,7 +446,4 @@
 	z-index: 2;
 	touch-action: none;
-}
-
-.wp-slider .ui-slider-handle {
 	background: #f6f7f7;
 	border: 1px solid #c3c4c7;
@@ -487,5 +474,5 @@
 }
 
-.wp-slider .ui-slider-handle:before {
+.wp-slider .ui-slider-handle::before {
 	background: none;
 	position: absolute;
@@ -494,39 +481,39 @@
 	color: #50575e;
 	content: "\f229";
-	content: "\f229" / '';
-	font: normal 18px/1 dashicons;
+	content: "\f229" / "";
+	font: 400 18px/1 dashicons;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
 
-.wp-slider .ui-slider-handle:hover:before,
-.wp-slider .ui-slider-handle.ui-state-hover:before {
+.wp-slider .ui-slider-handle:hover::before,
+.wp-slider .ui-slider-handle.ui-state-hover::before {
 	color: #1d2327;
 }
 
-.wp-slider .ui-slider-handle.from-handle:before,
-.wp-slider .ui-slider-handle.to-handle:before {
+.wp-slider .ui-slider-handle.from-handle::before,
+.wp-slider .ui-slider-handle.to-handle::before {
 	font-size: 20px !important;
 	margin: -1px 0 0 -1px;
 }
 
-.wp-slider .ui-slider-handle.from-handle:before {
+.wp-slider .ui-slider-handle.from-handle::before {
 	content: "\f139";
-	content: "\f139" / '';
-}
-
-.wp-slider .ui-slider-handle.to-handle:before {
+	content: "\f139" / "";
+}
+
+.wp-slider .ui-slider-handle.to-handle::before {
 	content: "\f141";
-	content: "\f141" / '';
-}
-
-.rtl .wp-slider .ui-slider-handle.from-handle:before {
+	content: "\f141" / "";
+}
+
+.rtl .wp-slider .ui-slider-handle.from-handle::before {
 	content: "\f141";
-	content: "\f141" / '';
-}
-
-.rtl .wp-slider .ui-slider-handle.to-handle:before {
+	content: "\f141" / "";
+}
+
+.rtl .wp-slider .ui-slider-handle.to-handle::before {
 	content: "\f139";
-	content: "\f139" / '';
+	content: "\f139" / "";
 	right: -1px;
 }
@@ -546,6 +533,6 @@
 
 .wp-slider.ui-slider-horizontal .ui-slider-handle {
-	top: -.25em;
-	margin-left: -.6em;
+	top: -0.25em;
+	margin-left: -0.6em;
 }
 
@@ -563,12 +550,8 @@
 }
 
-/* =Media Queries
--------------------------------------------------------------- */
-
 /**
- * HiDPI Displays
+ * Media Queries
  */
-@media print,
-  (min-resolution: 120dpi) {
+@media print, (min-resolution: 120dpi) {
 	.revision-tick.completed-false {
 		background-image: url(../images/spinner-2x.gif);