title: denying browser notification permissions
body: <p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Notification/requestPermission" rel="nofollow noreferrer">According to the spec</a>, you can prompt the browser to allow the user to grant or deny browser notifications. Once the user has granted permission, is there a way to programmatically deny that permission too? </p>
  
  <p>Calling <code>window.Notification.requestPermission()</code> after they have granted permission does nothing except run the success promise. </p>
  
  <p>My goal is to have an On/Off button toggle in the user settings portion of my site. As far as i can tell, there is no way to toggle off once toggled on. </p>