For bug 305746 I would like an extension to Mozilla CSS which is like @import, but it adds the imported style sheet to the cascade after the current style sheet. Discussed briefly with bz on IRC, my proposed syntax is: @-moz-post-import url(); I want to do this so that XUL can automatically import chrome://global/content/xul.css which will do the default styles, and then post-import chrome://global/skin/xul.css which will override theme-specific styles as necessary. (Same idea for all our other stylesheets). <bz> bsmedberg: would need to flag child sheets as coming after and modify the walking code accordingly. ... <bz> bsmedberg: how, if at all, should this be reflected in the CSSOM? <bsmedberg> whew, I'm not sure

What's the advantage of doing: @post-import url(b); ...RULES... over doing: @import url(a); /* contains ...RULES... */ @import url(b); ?

dbaron, mainly because it's an extra (third) CSS file for every one of our current content/skin pairs. It's not a terrible solution, if this would be hard to implement.

How many of these are you talking about? Your initial comment mentioned just xul.css. Do you mean every CSS file in the skin, or every package, or something else?

Oh, I guess you already said all of them, which makes sense.

Discussed further, and it seems a lot simpler to just have multiple import statements from ua.css, and have XUL files with two <?xml-stylesheet?> declarations.

OK, although if you decide you do want it *and it's reasonably simple to implement*, it would be fine with me. But I could imagine it being somewhat complicated, in which case I'd be a bit hesitant.