not/only

Media types also support the not and only keywords, which can be used to more conveniently locate a media device:

not: exclude certain media types

@media not print and (color){
}
only: Specify a specific media type, which can be used to exclude browsers that do not support media queries:

@media only screen and (color){
}

Full link of a great god
http://www.cnblogs.com/august...

I don’t know about this either. I was curious, so I checked it out
http://stackoverflow.com/questions/8549529/what-is-the-difference-betw...
It seems that these media types have a certain influence relationship. If you don’t add only, it will be inherited by other media types. Learned