What happens if requestKeyboardLock is called while 'enable keyboard lock' is true?

[mounirlamouri]

Reading the spec, it seems that it does nothing. For compatibility, I would recommend being explicit about it. In general, it's better to phrase things like:

[...]
- If enable keyboard lock is true, abort these steps.
- Register a system key press handler.
- Set enable keyboard lock to true.

[jamiewalch]

It's not a no-op; it replaces the set of reserved keys. This is covered by steps 1 and 2 of the algorithm.