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Use Conditional Server Side Includes – conditional css style sheets xssi

You can minimize HTTP requests by combining external CSS and JavaScript files. You can go even further by server-side including the remaining external files (with restrictions for XHTML due to its XML nature). One additional technique is to make those SSI work harder for you by serving up conditional content. Conditional server-side includes let you deliver different content based on environment variables sent by browsers to servers.

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