Compatiblizr
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Plugin for patching old versions of IE (7 and 8)to work with CSS3 selectors and Media Queries.
IE 7 and 8 don’t do CSS3 or Media queries so instead of adding the fixes to your theme you can add them via a plugin. This means when they finally die a death you can drop support without having to update your theme. This also covers purchased themes so you don’t need to alter the actual files.
This plugin is available for download for your site.