The text a keydown produces, or null when it produces none.
A printable key is one whose event.key is a single character, held without Ctrl/Cmd/Alt
(those are shortcuts) and outside a composition (the IME's own events carry that text).
Named keys - 'Enter', 'Backspace', 'ArrowLeft', 'Dead', 'Unidentified' - are longer than
one character, which is what keeps them out without a hand-maintained exclusion list.
The text a keydown produces, or null when it produces none.
A printable key is one whose
event.keyis a single character, held without Ctrl/Cmd/Alt (those are shortcuts) and outside a composition (the IME's own events carry that text). Named keys - 'Enter', 'Backspace', 'ArrowLeft', 'Dead', 'Unidentified' - are longer than one character, which is what keeps them out without a hand-maintained exclusion list.