On build Sublime Text calls Bless, which checks CSS if number of rules doesn't exceed Internet Explorer limitation.
Bless build can be combined with Less and SASS preprocessors as well.
Note: This package is build setup only. It does NOT contain required modules. To ensure Bless build will work correctly, see Prerequesites section.
Node.js and Blessc
If used with Less or SASS respective modules have to be installed. For Less install node.js Less module. For SASS install it's ruby counterpart.
Download and unpack to Sublime Text 2 Packages folder or use Sublime Package manager (Search for BlessCss)