Re: [uievents] Need 'Unspecified' value for KeyboardEvent.code (#20)

There are 3 cases of empty code value under current spec:

1. The platform tells UAs a valid scancode or something but proper value for it isn't defined
2. The platform does not tell valid scancode or anything.
3. The key is caused by virtual keyboard or something non-physical keyboard.

It may be impossible to distinguish #2 and #3 if they causes same scancode or something, though. So, only #1 case could cause specific value?

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