What to Test For
- Dead keys: Press every key — if nothing appears, the switch may be faulty
- Ghosting: Press 3+ keys simultaneously — cheap keyboards drop some inputs
- Chatter: Press once, see if it registers twice (common mechanical keyboard issue)
- Stuck keys: Release a key — it should immediately disappear from 'pressed' list
Why Test Your Keyboard?
- New keyboard QC: Verify all keys work before the return window closes
- Used/vintage keyboards: Check for worn switches before buying
- After spill cleanup: Confirm no keys are stuck or unresponsive
- Gaming prep: Ensure your WASD and ability keys have zero issues
- Mechanical keyboard mods: Test after swapping switches or keycaps
N-Key Rollover (NKRO) Test
- Press as many keys as you can simultaneously
- Cheap membrane keyboards: Usually 2-6 key limit (then 'ghosting')
- Gaming keyboards: Often 10+ keys or full NKRO
- Full NKRO means every key registers, no matter how many are pressed
- Critical for games requiring complex key combos (MMOs, fighting games)
Browser Limitations
- Some keys are captured by the OS: Print Screen, Win/Cmd key, some F-keys
- Browser shortcuts override testing: Ctrl+W, Ctrl+T, Ctrl+N won't register here
- Function keys (F1-F12) may trigger browser help or other features
- For complete testing, use a dedicated desktop app or test in incognito mode