How does mobile Safari determine when to prompt the user to share location in HTML?

When we have a requirement where we want to track the latest location of a user when he is in a specific area, then we write separate code. The code in the HTML that determines when to prompt the user to share their location is as follows:

if (frstTime) { //First time    
   navigator.getCurrentPosition(function (coordinates) {      
      if (coordsAreInTheBox) {          
         storeCoordsForUser();          
         navigator.watchPosition();      
      }    
   });
}  

else if (userInlocat) {    
   navigator.watchPosition();
}

It works as expected on first load. It will check whether the user is here for the first time; if so, the navigator gets the current location. After that, based on the coordinates in the box, we observe the position. If the user is at a certain location, observe the location.

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