What special features does Compass have?

Wh开发者_开发百科at features does Compass have that the standard Sass portion of the HAML gem does not?

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From https://github.com/chriseppstein/compass

A Sass-based CSS Meta-Framework that allows you to mix and match any of the following CSS frameworks:

• Compass Core, Blueprint, 960, Susy, YUI
• Other frameworks can be added relatively easily