The onpopstate event is triggered in the window object when the active history entry changes, such as when the user navigates to a different page using the back or forward buttons in the browser.

History API and onpopstate:

Event: window.onpopstate

Description: This event is fired when the user navigates to a session history entry, i.e., when moving backwards or forwards in the browser history.

Example:

window.onpopstate = function(event) {

console.log("location: " + document.location + ", state: " + JSON.stringify(event.state));

};

Other Options:

A. Window, location: location is an object containing information about the current URL.

C. Window, name: name is a property to set or get the name of a window.

D. Window, open: open is a method to open a new browser window or tab.

References:

MDN Web Docs - window.onpopstate

W3Schools - JavaScript History API