Cmd-Enter doesn't work on Mac OS X because I use keyup event and apparentely this specific event is not fired when the meta/cmd key is pressed on mac os x
Example issue elsewhere: https://github.com/electron/electron/issues/5188
Suggested fix was to start listening to keydown instead
on keydown[(ctrlKey or metaKey) and key == 'Enter']
call my checkValidity()
if the result is true
submit() me
otherwise
call my reportValidity()