How does setTimeout function work in javascript?

Question

Can anyone please explain how does setTimeout function work in javascript? I'm attaching a onclick listener to some HTML element and the onclick function provides a call back function there. When I click the HTML element, it redirect to another page. My question here will be the following :

1. Will the call back function be executed after the click? I did some testing and looks like it get dropped in the middle of some where.
2. If I put the call back function using setTimeout(function(){...}, 0) , does that mean it will be putting on a background thread and always being fully executed?
3. Can someone please help explain the mechanism behind the setTimeout function?

Thanks a lot,

Answer 1

Take a look at the MDN page for setTimeout.

MDN setTimeout Documentation

It would really help to see some code implementation but generally a callback with a timeout delay of 0 would call the given callback instantly.