Using responsive images and srcset to deliver high quality images on all screen sizes

To achieve the second goal, we can use layout="responsive" again, so that the thumbnails will scale for larger screens. The HTML for each item in the list now looks like this:

<li>  <figure class="related-thumb">    <amp-img src="img/penguin.jpg" width="125" height="75" layout="responsive"></amp-img>    <figcaption>      If a penguin can find a soul mate, I'm sure I can too      <span class="author">Rebekah Crane</span>    </figcaption>  </figure></li>
Thumbnails in 2x2 grid and with layout="responsive" scaling up on a larger screen (tablet device in portrait orientation)

There ...

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