darcyclarke/Front-end-Developer-Interview-Questions — pull request #18 by danab (2012-07-31 02:34:35+00:00)
Title: Moved FOUC from JS section to CSS section

If I'm not mistaken Flash of Unstyled Content is more of a CSS issue having to do with @import and inline styles.

Googling FOUC + javascript I see things about techniques for hiding the content until the load event fires. If this is what the question was meant to refer to then I would not consider that a best practice, and not something I would consider to be essential knowledge.