I'm not sure I completely understand the way the previous assert works, which is why I created a new assert - but it looks to me like some bytes could be shaved by integrating this into the previous assert, directly after the other push of :enabled, :disabled - IE8 won't run the test, but it will have already added enabled/disabled to buggyQSA (right?) and the triggering of the opera error doesn't seem to rely on the div content at all.