Keyboard Testing Limitations and Disclaimer
Updated
Keyboardtest tools and guides provide observations and general troubleshooting information. They do not certify a keyboard's condition, identify an internal component failure or guarantee that a repair will work.
What a missing event means
A key may fail to reach a page because of focus, browser behavior, an operating-system shortcut, remapping, an input method, a connection issue or hardware. Fn and media controls may be handled outside the browser. A missing highlight alone is not proof of a dead switch.
Timing and rollover limits
Browser timestamps describe browser events. They do not directly measure switch actuation, USB polling rate, scan rate or full input-to-display delay. Rollover counts show the combinations observed in a particular session, not certification that every combination works. Chatter thresholds flag patterns for comparison; they do not prove the cause.
The testing methodology provides the full interpretation and primary references.
Before repairing a device
Compare another application, connection or computer where practical. Follow the manufacturer's instructions, warranty terms and safety guidance before cleaning or replacing parts. Stop testing a device after liquid exposure or visible electrical damage and seek model-specific advice.
Availability and external material
Results depend on your browser and device. Tools and documentation can contain errors or become outdated. External references have their own content and privacy practices. See the terms of service for use of the site, or report an error.