Test external keyboards, mechanical keyboards, multi-key input, and browser keyboard events.
Key Test
Press keys directly after opening the page. Tested keys stay green and currently pressed keys turn blue. On Mac, testing F1-F12 usually requires holding Fn.
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System shortcuts, Fn layers, some media keys, and power keys may be intercepted by the operating system before the browser receives them. On Mac, F1/F2 and nearby keys are often handled as brightness, volume, or media controls; press Fn + F1-F12, or enable “Use F1, F2, etc. keys as standard function keys” in system keyboard settings. event.code is the physical key position; event.key depends on input method and OS keyboard layout.