you can show a `fallback` in case the image couldn't be loaded. This is great for adding offline support to your AMPs.
  -->
  <amp-img src="/img/does-not-exist.jpg" width="300" height="100" layout="responsive">
    <div fallback>offline</div>
  </amp-img>
  
  <!-- ## No script -->
  <!--
    If you want to ensure that users with JavaScript disabled can see your images, you can add an additional `img` element inside a `noscript` tag. This also makes it possible for webcrawlers without JavaScript runtime to