Include/import uss files inside uss files

My USS file is getting quite long. Does USS support includes, like:

Code (CSharp):

1. @import url("filename.uss");

I can't get it working, but I also don't get error messages.

Perhaps I am using USS in an unintended way, if so do let me know. I found it simplest to import a single file at EditorWindow.OnEnable and add it to the root element instead of specific elements.

 

Ok. No warning or error though.

 

I know this thread is a couple years old, but for anyone coming from the web like myself, and to @cecarlsen if you're still looking:

You can use multiple stylesheets in a single .uxml definition, like in the image below


It may not be your original ask, but there is also a .TSS theme file where you can specify multiple icons and stylesheets to create a theme. I would love to point you to a documentation page on how to use it but I am trying to find out myself in this thread:
https://forum.unity.com/threads/intended-use-of-theme-style-sheet.1081955/

 

Great, thanks for the update @jonathanma_unity! I've noticed that there are two ways one can import an USS file into another - @

import url("filename.uss");

and @

import "filename.uss";

. Is there a reason why one would chose former over the latter, or vice versa?