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Product Manuals and Release notes
When a CSS link appears at the top of the page, preceding the </head> element, a browser can progressively render the page to quickly display the content, especially beneficial for users who access content-rich pages by means of slower Internet connections.
If a client requests an HTML document for which the response header contains a Cache-Control: private, Cache-Control: no-store, or Vary: User-Agent header, the BIG-IP system removes the inline content from the response, and caches the inline content.
When you use inlining functionality, the following conventions provide best results.