Define a key timeout

 

this event is always executed after defined milliseconds, if no key is pressed

and is always executed again after defined time

 

let InternalNumber=window.setKeyTimeout(function,timer in milliseconds)

 

(Note: system check only keyboard activities)

 

 

you can clear this timer with

window.clearKeyTimeout(internalNumber);

 

Example:

close window, if user do nothing after 10 seconds

 

window.setKeyTimeout(()=>window.cancel();,10000);