In Chrome you can find it out by searching for 'exit-intent' event and setting a breakpoint on that. They use the mouseleave event on an element that covers the

In Chrome you can find it out by searching for 'exit-intent' event and setting a breakpoint on that. They use the mouseleave event on an element that covers the whole page. When your mouse leaves the web page viewport it will trigger that. Neat, and annoying as heck.