What MIME Types does my browser support?
What are MIME Types?
Your browser has a list of MIME Types which helps it understand how to process files it receives from a webserver.
...in more detail...
Every time your web browser receives a file from a web server, the server includes a "Content Type" description for that file. Your web browser then matches that "Content Type" with its own list of "MIME Types" that it knows how to deal with, in order to understand how it should handle that particular file.
For example, if you viewed a JPEG image on a web page, the web server will have included a Content Type of "image/jpeg" as your browser downloaded it. This then lets your computer know that it's an image in the JPEG format, and so it should treat it as such and try and show it on the screen.
What does MIME stand for?
MIME stands for "Multipurpose Internet Mail Extensions". The concept of MIME Types was originally created to be used with email programs; hence the "Mail" part of the acronym. MIME Types are now also used by web browsers.
What MIME Types exist?
The IANA (Internet Assigned Numbers Authority) keeps an extensive list of the defined MIME Types. You can view it at: http://www.freeformatter.com/mime-types-list.html