I'd give serious consideration to something like: static/style/foo.css containing the comment /* See static/style/foo.css.src on this domain */ since yo

I'd give serious consideration to something like: static/style/foo.css containing the comment /* See static/style/foo.css.src on this domain */ since you want the source for the deployed version, not master, and we're trying to make things easy for people grokking what's deployed, not express an opinion about branch naming and deployment practices :) Publishing the repository URL and/or deployed branch/tag/revision might also be awesome, but it serves a different albeit overlapping set of goals.