How to make the stopwatch not stop when switching to another tab?

Question

JavaScript

Hello everyone, there is such a code:

How to make the stopwatch work correctly when switching to another browser tab and then returning.

Answer 1

The logic is like this.
When creating a timer, get its start time and write it to localStorage, when determining the inactive state of the page, write this time there as well. And when you return, having calculated the time difference, you continue to count from the right moment.