Re: [uievents] How do web apps distinguish if a keydown event causes text input? (#18)

And also there is another use case of this (I forgot to say this):

I cannot suggest a realistic scenario, though. Currently, web apps cannot distinguish if the KeyboardEvent is inputting text or representing a non-printable key event with KeyboardEvent.key.

For example, web apps might check with this logic:
if (event.key.length > 1) {
  // non-printable key
} else {
  // printable key
}

But this is wrong in some cases if a key causes two or more characters. E.g., when the .key value is non-BMP character, including IVS or something similar code.

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