Touch & input
As needed · Runs in this browser
Test browser-observed keyboard rollover using a realistic layout, live held-key count, peak simultaneous-key tracking, and common gaming combinations such as WASD, Shift, and Space.
Hold several physical keys together. Every highlighted key is an event your browser received at the same time.
Click or Tab here, then hold your key combination
No keys held
Preset combination
Hold W + A + S + D + Shift + Space - detected 0 of 6.
A missing highlight can indicate keyboard matrix blocking, the operating system, or browser handling. This observes delivered key events; it cannot certify the keyboard controller itself.
Transparent method
This tool reports only interactions and browser APIs it can observe. It does not infer hidden hardware specifications or turn unsupported access into made-up results.
Useful context
Ghosting commonly describes missing or unintended key signals when several keys are pressed together. This page shows the key events that reach your browser.
No. It can reveal combinations that do or do not arrive as browser events, but the keyboard controller, connection, operating system, and browser are all part of the observed path.
Troubleshooting
Keep checking