dfn -webkit-user-select (w3c#5603)

Author: gsnedders

css-ui-4/Overview.bs

@@ -1768,7 +1768,7 @@ Issue: the list above is incomplete and needs to include
 at least the various button-like variants of <{input}>.
 
 For compatibility with legacy content,
-UAs that support 'user-select' must also support ''-webkit-user-select'' as an alias.
+UAs that support 'user-select' must also support <dfn property>-webkit-user-select</dfn> as an alias.
 
 Note: The details of the aliasing mechanism is intentionally left up to the UA.
 Making ''-webkit-user-select'' a shorthand property of 'user-select'