Hm. `setDocumentTitle` vs `window.document.title =` is 17 vs 24 characters. I'd say go with the explicit one, otherwise you're just hiding stuff. It doesn't really matter in this case but if the philosophy is used everywhere it makes a difference to how readable the code is.

If I see `setDocumentTitle` I have to assume anything could happen, but `x =` is much harder to hide weird crap in.