Automattic has rolled out a new update for the users of Custom CSS on their WordPress.com platform.
Users registered for this paid feature can now use CSS3 properties on their blogs.
They have also updated the CSS editor to make it more intuitive. WordPress.com said:
The CSS editor itself has been upgraded too! Now that we’re using Ace, it’s just like having a desktop code editor in the browser: syntax coloring, auto-indentation, and immediate feedback on the validity of the CSS you’re writing are just a few of its features.