No ticket. Optimize the marginRight hook: run the support test once only.

src/css.js

@@ -458,6 +458,8 @@ jQuery.cssHooks.marginRight = {
 			delete jQuery.cssHooks.marginRight;
 			return;
 		}
+
+		jQuery.cssHooks.marginRight.get = function( elem, computed ) {
 			if ( computed ) {
 				// Support: Android 2.3
 				// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
@@ -465,6 +467,9 @@ jQuery.cssHooks.marginRight = {
 				return jQuery.swap( elem, { "display": "inline-block" },
 					curCSS, [ elem, "marginRight" ] );
 			}
+		};
+
+		return jQuery.cssHooks.marginRight.get( elem, computed );
 	}
 };
 
@@ -480,6 +485,7 @@ jQuery.each( [ "top", "left" ], function( i, prop ) {
 				delete jQuery.cssHooks[ prop ];
 				return;
 			}
+
 			jQuery.cssHooks[ prop ].get = function ( i, prop ) {
 				if ( computed ) {
 					computed = curCSS( elem, prop );
@@ -489,6 +495,7 @@ jQuery.each( [ "top", "left" ], function( i, prop ) {
 						computed;
 				}
 			};
+
 			return jQuery.cssHooks[ prop ].get( i, prop );
 		}
 	};