For more comfortable to use we need to take user permission to display web notification.

document.addEventListener('DOMContentLoaded', function () { 
	if (Notification.permission !== "granted")
	{
		Notification.requestPermission(); 
	}
});

This function will help you to push notification data, here you have to update icon URL.Also you can pass title, description and Web URL.

if(window.Notification && Notification.permission !== "denied") {
		Notification.requestPermission(function(status) { // status is "granted", if accepted by user
		var n = new Notification('Title', {
			body: 'I am the body text!',
			icon: '/path/to/icon.png' // optional
		});
		}); 
}