Changes

Toplevel browsing contexts can be in a "keys disabled" state. In this state,

the user agent must suppress all keyup, keydown and keypress events whose keyCode is not in one of the following ranges:

Such events are not dispatched to any nodes in any document of the toplevel browsing context or descendant browsing contexts. This includes suppression of any internal key event processing that would insert text into form controls or editable content. The user agent might respond to such events by leaving fullscreen mode.