Index: src/wp-admin/css/admin-menu.css
===================================================================
--- src/wp-admin/css/admin-menu.css	(revision 32263)
+++ src/wp-admin/css/admin-menu.css	(working copy)
@@ -10,7 +10,7 @@
 	position: fixed;
 	top: 0;
 	bottom: -120px;
-	z-index: 9980; /* just beneath #adminmenuwrap */
+	z-index: 1; /* positive z-index to avoid elastic scrolling woes in Safari */
 }
 
 #adminmenu {