Detect Browser Back Button using Javascript

browserbackbutton.js

window.onload = function () {
            if (typeof history.pushState === "function") {
                history.pushState("state", null, null);
                window.onpopstate = function () {
                    history.pushState('newstate', null, null);
                    //Browser Back Button Pressed - Put your logic here onwards.
                };
            }
        }