This will force a synchronous layout, right? I suppose there's no way to avoid it but I wonder if there is a less expensive way to do it, for example with a different element attached to the body.

I was thinking that using an element added to the DOM would trigger layout even more.

This is been removed.

Eeek! Pick a different parent so we're not screwing with the fixture container.

Heh, make up your mind. I don't see the danger if the CSS is reset, but I'll change it.

I said the font-size should be explicit (which I stand behind), but we should never be manipulating #qunit-fixture directly—only its contents are fair game.

Yea, thought you were suggesting to use #qunit-fixture and be explicit about font-size when you asked why I was appending to #nothiddendiv, but I think I misread that.

That's not true for e.g. .css( "borderWidth", "+=2px" ).

I think it is, actually.

/me slaps forehead

I guess that's kind of the point, huh?