Keyboard Rollover Test
Press and hold several keys to see which simultaneous inputs reach your browser. Check combinations used for gaming, typing and keyboard rollover observations.
Hold a key combination
Start the test, focus the area, then hold keys together. Try W + A + S + D, Shift + movement keys, number row combinations or several letters.
Press Start, then hold keys here
Currently held keys appear as you press them. Release all keys to clear the row.
Test stopped. Start when ready.
What this means: this shows simultaneous keys received by the browser. Operating system or browser interception means it is not formal 6KRO or NKRO certification.
Rollover observations
Recent event history
Only report the keys the page receives
Rollover is the number of simultaneous keys a keyboard can register. Ghosting is an unintended key signal caused by certain key combinations. A blocked or missed key is a press that does not reach the page. This test records actual browser key events and does not invent missing or ghosted inputs.
Try multiple combinations because a keyboard may handle some key groups differently. Seeing one combination arrive does not establish that every possible combination is supported.
Keyboard rollover FAQ
What do 6KRO and NKRO mean?
6KRO usually describes registering up to six non-modifier keys at once. NKRO means n-key rollover, where a keyboard can report more simultaneous keys. This browser check is an observation, not certification of either specification.
What is keyboard ghosting?
Ghosting is an unintended key signal from a combination of keys. This page displays only events it receives, so it cannot identify a key the operating system or browser never sends.
Why might a key combination be missing?
Keyboard matrix design, firmware, operating system shortcuts and browser handling can all affect combinations. Test other combinations and compare on another setup.