How to determine in a minimized browser tab that the user is inactive?

Question

JavaScript

I'm writing a small javascript script to track the time of work on projects. And the following question arose: is it possible to somehow determine that the user is inactive - he does not move the mouse, did not press the keys, the screen saver turned on, etc.?
I understand how to do this in the active browser window. But is it possible to somehow determine this when the window is minimized?
Perhaps browser extensions have access to some kind of API? Or some module for Node.js? In general, any options, if they exist, will do.

Answer 1

In general, this cannot be done using javascript for security reasons.

Answer 2

No. You can only determine that the user has closed / minimized the tab.

Answer 3

This is done with the focus/blur event hung on the document

Answer 4

Do it on node-webkit
Everything will be there.