Anti-Ghosting Test

Keyboard ghosting occurs when pressing multiple keys simultaneously causes an unpressed adjacent key to register erroneously, or causes an actual keypress to be blocked due to electrical limitations in the keyboard matrix wiring.

Anti-ghosting refers to engineering features (such as optimized matrix layouts, isolation diodes, or multi-channel controllers) that prevent ghost keystrokes and ensure multiple intended keys register simultaneously.

Key rollover (KRO) defines how many simultaneous keys can be depressed at once while still being accurately registered. For example, 2KRO supports 2 keys, 6KRO supports 6 keys, and NKRO (N-Key Rollover) supports unlimited keys.

NKRO stands for N-Key Rollover. In hardware terms, an NKRO keyboard features an individual diode on every switch, allowing every single key on the keyboard to be pressed down simultaneously without masking or blocking.

Missing key registrations in browser testing typically stem from matrix blocking (membrane keyboards sharing electrical traces), USB HID report limitations, or operating system hotkey interception.

This test measures browser-visible keyboard events. While it accurately diagnoses whether the browser received the keystrokes, it cannot inspect physical electrical contacts or firmware debounce circuitry directly.

Standard membrane keyboards use shared matrix traces. Keys located on separate electrical circuits register fine together, but three or more keys sharing the same matrix row and column will trigger blocking.

Yes. Certain OS-level shortcuts (like Ctrl+Alt+Del or Cmd+Tab) are consumed by the operating system and never forwarded to web browsers. Running the test with browser focus ensures the cleanest signal capture.

Choose the 'Gaming' or 'WASD' preset, press down all designated keys together, and observe the live visualizer. Check the 'Max Simultaneous' counter to verify multi-key rollover behavior.