Compatibility
You can check a server to see if it is sending out compressed data, and compression compatibility of your browser for example here.
When textual content compressed using mod_gzip, it should maintain its MIME-type, according to their recommended media type:
- HTML: text/html
- XHTML: application/xhtml+xml
- CSS: text/css
- JavaScript: application/x-javascript
Read more about this topic: Mod Deflate