A Best Practice for Programming with Vendor Prefixes

Vendor prefixes enable Web developers to experiment with new standards before they reach the Candidate Recommendation stage. I previously wrote how these prefixes are also a mechanism browser vendors use for handling timing conflicts between implementations and specifications. In building demos of new features for our IE Test Drive site and in various presentations, many of us on the IE team deal extensively with vendor prefixes.
This blog post describes a pattern we’ve used in some recent demos that’s making things significantly easier for us and has become a best practice. We’d like to share it with you and hear your thoughts on this approach or any others you consider a best practice.