Index: wp-admin/js/revisions.js
===================================================================
--- wp-admin/js/revisions.js	(revision 24759)
+++ wp-admin/js/revisions.js	(working copy)
@@ -28,7 +28,7 @@
 	$.fn.allPositions = function() {
 		var position = this.position() || {top: 0, left: 0}, parent = this.parent();
 		return _.extend( position, {
-			right:  parent.outerWidth()  - position.left - this.outerWidth(),
+			right:  parent.offset().left + parent.outerWidth() - position.left - 1,
 			bottom: parent.outerHeight() - position.top  - this.outerHeight()
 		});
 	};
@@ -580,27 +580,33 @@
 	// The tickmarks view
 	revisions.view.Tickmarks = wp.Backbone.View.extend({
 		className: 'revisions-tickmarks',
+		direction: isRtl ? 'right' : 'left',
 
 		initialize: function() {
 			this.listenTo( this.model, 'change:revision', this.reportTickPosition );
 		},
 
 		reportTickPosition: function( model, revision ) {
-			var elWidth, offset, tick, index = this.model.revisions.indexOf( revision );
+			var offset, tick, index = this.model.revisions.indexOf( revision ),
+				divOffset = this.$el.offset();
 			if ( index === this.model.revisions.length - 1 ) {
 				// Last one
-				tick = this.$('div:nth-of-type(' + index + ')');
+				tick = this.$('div:nth-of-type(' + ( index ) + ')');
 				offset = tick.allPositions();
-				elWidth = tick.outerWidth();
-				// adjust
+
+				// Adjust
 				_.extend( offset, {
-					right: offset.right + elWidth + 1,
-					left: offset.left + elWidth + 1
-				});
+					left: this.$el.offset().left + this.$el.width() - this.$el.parent().offset().left - 1,
+					right: this.$el.offset().left + this.$el.width()
+				} );
 			} else {
 				// Normal tick
 				tick = this.$('div:nth-of-type(' + (index + 1) + ')');
 				offset = tick.allPositions();
+				_.extend( offset, {
+					left: offset.left + this.$el.offset().left - this.$el.parent().offset().left
+				} );
+
 			}
 			this.model.set({ offset: offset });
 		},
@@ -610,9 +616,10 @@
 			tickCount = this.model.revisions.length - 1;
 			tickWidth = 1 / tickCount;
 
-			_(tickCount).times( function(){ this.$el.append( '<div></div>' ); }, this );
+			_(tickCount).times( function( index ) {
+				this.$el.append( '<div style="' + this.direction + ': ' + ( 100 * tickWidth * index ) + '%;"></div>' );
+			}, this );
 
-			this.$('div').css( 'width', ( 100 * tickWidth ) + '%' );
 		}
 	});
 
Index: wp-admin/css/wp-admin-rtl.css
===================================================================
--- wp-admin/css/wp-admin-rtl.css	(revision 24759)
+++ wp-admin/css/wp-admin-rtl.css	(working copy)
@@ -1026,7 +1026,7 @@
 
 .revisions-tooltip {
 	margin-left: 0;
-	margin-right: -70px;
+	margin-right: -84px;
 	-webkit-transition: right 15ms;
 	-moz-transition:    right 15ms;
 	-ms-transition:     right 15ms;
Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 24759)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -3527,22 +3527,22 @@
 	vertical-align: text-bottom;
 }
 
-.revisions-tickmarks {
+.revisions-tickmarks,
+.revisions-tooltip-container {
 	position: relative;
 	margin: 0 auto;
 	height: 0.8em;
 	top: 7px;
-	width: 100%;
-	padding: 0 15%;
+	width: 70%;
+	padding: 0;
 	-moz-box-sizing: border-box;
 	-webkit-box-sizing: border-box;
 	box-sizing: border-box;
 }
 
 .revisions-tickmarks > div {
-	position: relative;
+	position: absolute;
 	height: 100%;
-	float: left;
 	border-style: solid;
 	border-width: 0 1px 0 0;
 	-moz-box-sizing: border-box;
@@ -3550,10 +3550,6 @@
 	box-sizing: border-box;
 }
 
-.revisions-tickmarks > div:last-child {
-	border-width: 0;
-}
-
 .comparing-two-revisions .revisions-controls {
 	height: 140px;
 }
@@ -3737,12 +3733,12 @@
 
 .revisions-tooltip {
 	position: absolute;
-	bottom: 105px;
+	bottom: 104px;
 	margin-right: 0;
-	margin-left: -70px;
+	margin-left: -69px;
 	line-height: 28px;
 	z-index: 1;
-	max-width: 350px;
+	max-width: 250px;
 	min-width: 130px;
 	padding: 4px;
 	display: none;