Refer to this doc - https://www.zkoss.org/wiki/ZK_Developer's_Reference/UI_Patterns/Keystroke_Handling#Control_Keys

 Steps to Reproduce

1. Run the example on Mac's chrome - https://zkfiddle.org/sample/thvp0e/1-Mac-s-ctrl-key-and-alt-key-are-wrong

Current Result

No any log appears.

Expected Result

Should see a log with keycode as the same as Window's chrome.

Debug Information

Mac's chrome keycode is wrong with Windows'