Key Rollover Test: Check Simultaneous Key Presses
Start and focus the test area. Press physical keys or hold combinations. Automatic key repeats are identified separately. Browser and operating-system shortcuts may not reach the page.
Results
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How to use this tool
Start and focus the test area. Press physical keys or hold combinations. Automatic key repeats are identified separately. Browser and operating-system shortcuts may not reach the page.
| Results | Method and units |
|---|---|
| Maximum | max |pressed| |
| Held keys | KeyboardEvent.code |
Example
Held keys: KeyA + KeyS + KeyD · Maximum: 3
What this test can and cannot tell you
Results reflect events and signals available to your browser. Settings, permissions and device support can affect them; they do not certify that hardware is healthy or faulty.
Stick radius and held-key counts describe browser data, not certified hardware specifications