The experiments show what can be done with new CSS3 properties. CSS3 has currently not been ratified so the browser enhancements -moz and -webkit are used to achieve the effects.

The button below is based on Twitter's sign-up button so presumably it has been thouroughly tested.

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More webkit and moz properties

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More info on CSS3 properties and browser enhancements

Web Designer Wall border props tutorial

Super awsome buttons with RGBA. See all the thread for issues.