MacBook Keyboard Tester

Press any key - the matching keycap lights up (blue-violet backlight). Tested keys get a green outline.

中文版

F1–F12: On Mac these are brightness/media keys by default. Hold fn while pressing an F key, or enable "Use F1, F2, etc. keys as standard function keys" in System Settings → Keyboard.
fn key: It normally never sends a keypress event to web pages, so it cannot be tested here (its keycap is outlined with a dashed border).
Caps Lock: It is a toggle key - keydown fires when you turn it on, and keyup only fires on the next press. This is normal (the page flashes it briefly).
Combinations that cannot be intercepted: Cmd+W / Cmd+Q / F12 and system-level shortcuts (such as screenshot Cmd+Shift+3/4) are not under web page control - please avoid them while testing.
Suspect conflicts: A keycap that stays lit for more than 5 seconds is flagged as a "suspect conflict" (keyup may never have fired). Click the keycap to clear it manually.

0Tested keys

0Total keys

0Held now

0Suspect conflicts

Untested keys:

Keypress log (last 20, newest first)

Time	Key	event.key	event.code	Count
No records yet. Press any key to start testing.