Javascript: Programmatically trigger onbeforeunload/onunload event

Question

How can I programmatically trigger onbeforeunload and onunload events?(No jquery please). I've tried:

var event = new Event('onbeforeunload');
event.initEvent("onbeforeunload", true, true);
window.document.dispatchEvent(event);

Answer 1

window.dispatchEvent(new Event('beforeunload'))

I think this would be the best way in 2020. In case anyone finds this.

window.addEventListener('beforeunload',()=>{console.log("beforeunload triggered")})
window.dispatchEvent(new Event('beforeunload'))