IE-friendly mobile-first CSS with Sass 3.2
Jake demonstrates his technique for preprocessor-generated stylesheets for older versions of Internet Explorer (while other browsers get the same styles within media queries).
Link tags: preprocessing
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“Mobile first” CSS and getting Sass to help with legacy IE – Nicolas Gallagher
If you use Sass, this could be a really handy technique for handling IE<9 support with mobile-first responsive designs.