Clock & Timer
Developer tools
Device Tests
Observe keyboard, mouse and screen interactions locally in your browser.
The interactive workspace could not be loaded. Refresh the page to try again.
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How it works
Choose Keyboard Test, Mouse Test or Screen Test. Activate the keyboard area before using physical keys, interact inside the mouse area, or switch screen colors manually. Reset clears keyboard and mouse observations.
Useful notes
All observations remain in page memory and clear on reset or reload. Browser and operating-system shortcuts may not reach the page. No microphone, camera, speaker, recording or network-speed checks are performed.