In this case it would only disappears altogether when ‘Recognition’ is fully visible though, which is beyond 1651 pix height.
But they do indeed sell this size (an incorrect earlier assumption on my part) – I was only recently viewing a 5K retina display. That’s certainly a big Mac (and a responsive design concern).
Here’s two views pasted on top of each other (1280×927) :
Edit – not too sure about the Mac now. Actual screen height is 1440 maybe?
