title: Request location coordinates after user has blocked access in javascript
body: <p>How can I prompt a user for their geo-location in javascript if they've blocked my request in the past? (using <a href="https://developer.mozilla.org/en-US/docs/Web/API/Geolocation/Using_geolocation" rel="noreferrer"><code>navigator.geolocation.getCurrentPosition</code></a>).</p>
  
  <p>For example,  my web app requires location services, and the user accidentally clicks "block", or they change their mind. What can I do to prompt them again?</p>