Step by step
- Click the page once.
- Press every key, including F-keys and the number pad.
- Look for keys that never turn green.
At a glance
| Key | What happens | Normal? |
|---|---|---|
| Windows key | Lights and opens Start | Yes |
| PrtSc | May open the Snipping Tool | Yes |
| Fn | Never lights | Yes, it stays in the keyboard |
| Alt+F4, Ctrl+W | Closes the page | Avoid during the test |
Related questions
Do I need to download a tool?
No, the test runs in the browser.
A key works here but not in a program. Why?
The program may use that key differently; check its shortcuts.
How do I reset the test?
Press Reset.
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Updated November 14, 2026.