Keyboard Test
Press any key on your keyboard - it should light up below. A key that never lights up no matter how hard you press is a strong sign of a dead switch; a key that lights up but won't turn off (stuck) points to a stuck key or debris under it.
Last key: (none yet)
Code: - | keyCode: -
Keys currently held: 0
Everything here runs locally via standard keydown/keyup events - nothing is recorded, saved, or sent anywhere. Keys are identified by their physical position (KeyboardEvent.code), so the layout lights up correctly regardless of your OS keyboard layout or language. "Keys currently held" is a rough check for rollover/ghosting - if pressing several keys at once stops registering new ones, your keyboard (or the connection/port it's on) has a simultaneous-key limit.
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