the cap-lock key generates different events on windows and mac.

on windows, clicking (press first and then release) cap-lock will generate keyPress and keyRelease events.

on mac, doing the same will generate only keyPress. unless you press the cap-lock key again, you will not see keyRelease.

so on mac, clicking cap-lock will only generate one event. the event is either a keypress or a keyrelease. this behavior is different from other keys, and also different from the cap-lock behavior on windows.

the attachment is a simple program demonstrating the issue. try to compile and run it on both windows and mac, just click cap-lock and observe the difference in debugger outputs.