What does setInterval do if the page that contains the callback function is closed code example

Example 1: javascript setinterval

setInterval(function() {
  //Your code
}, 1000); //Every 1000ms = 1sec

Example 2: javascript setinterval

setInterval(function(){ 
	console.log("print this once every 3 second");
}, 3000);//run this thang every 3 seconds