qss for content field

project addr : https://github.com/FortAwesome/Font-Awesome

When I was in the use of the Font - Awesome.
Suddenly there was a good idea, that is, the use of the `content` in  QSS  keyword.
Let the program by default to load the Font - Awesome, as WEB engineering load in the same way, so project become more automatic.
I don't realize, however, there are differences between the QSS and CSS is.
Whether can increase `content` field in QSS?