You can install the Aptana Studio 3.0.3 plugin , which supports CSS3 properties. Aptana Ticket # 1986 shows how to enable mappings for specific browser provider extensions. Ticket # 1495 also matters.
A WARNING! I read in How to add FTP support for Eclipse? That plugin can potentially overwrite or reorganize a lot of your Eclipse workspace. This is an older answer, so a new version of the plugin might be better. I would not want my advice to violate your Eclipse without first warning you :-)
andyb
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