Last updated December 12, 2012. Created by gaele on December 12, 2012.
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Respond.js provides IE 6-8 support for min-width and max-width CSS3 media queries.
Respond.js only works on <link> tags; it will not work on @import stylesheet calls. Drupal 7 uses @import when CSS aggregation is disabled, but uses <link> when CSS aggregation is enabled.
So go to /admin/config/development/performance, and enable Aggregate and compress CSS files.