[lazaroclapp]

Since this can make you think your cursor is in a different position in the page than it actually is, couldn't it potentially be used to mislead you to click outside the page as well? Possibly not into browser chrome[1], but what about on a iframe?

Place button A the user wants to interact with at position (X,Y), place iframe button B at position (X+W,Y), with as little a border as possible with the rest of the page, then offset fake cursor by -W. User will try to mouse over button A, mistakenly mouse over button B, and click it in the time it takes to register that the mouse pointer just jumped from the edge of one button to the edge of the other...

[1] Though I can see the trick below maybe working for some browser's permission request "tooltip" UIs...