How to interpret the result
Missing events can indicate a hardware switch, matrix limitation, firmware mapping, browser shortcut, operating-system interception, or accessibility setting. Repeat outside the browser before concluding.
KB / 5 min
Online keyboard event and rollover test
Test every mapped key, inspect keydown and keyup codes, and measure how many simultaneous keys the browser receives.
Local-firstNo accountExportable report
LIVE
LOCALLive test
0 held now0 maximum held0 / 76 mapped keys tested0 non-repeat keydown events
Focus this area, then press each key and the combinations you use.
EscF1F2F3F4F5F6F7F8F9F10F11F12
`1234567890−=Backspace
TabQWERTYUIOP[]\
CapsASDFGHJKL;′Enter
ShiftZXCVBNM,./Shift
CtrlMetaAltSpaceAltCtrl←↑↓→
UntestedTested this sessionHeld now
Session readout
This records only events delivered to this browser. Re-test a concern in another app before deciding whether it is hardware, layout, firmware, wireless, accessibility, or an OS shortcut.
| Event | Code | Repeat |
|---|
What this browser test can and cannot prove
The browser cannot distinguish all firmware-level ghosting, debounce quality, scan rate, switch chatter outside the event stream, or keys reserved by the operating system.
REPORT
Reports →Keep this result in a local inspection report.
RELATED
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Open testGamepad buttons and axes
Read connected gamepads, buttons, triggers, stick axes, timestamps, and mapping through the browser Gamepad API.
Open testKNOWLEDGE
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