I just ran some tests and it appears that `Element.ALLOW_KEYBOARD_INPUT` has no effect whatsoever.

In Safari, users are _not_ able to enter page numbers, even if the parameter is present. According to a (non-public) response from Apple that one developer has [shared](http://stackoverflow.com/questions/16150601/substitute-for-allow-keyboard-input-javascript-full-screen) that's the intended behavior. (At least they fixed the bug that aborted full screen when the parameter was present.)

In Chrome, users _are_ able to enter page numbers regardless of whether this parameter is present or not.