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CSS:

amp-img { border: 2px solid #ccc; border-radius: 50%; }
<amp-img alt=""
  layout="fixed"
  width="200"
  height="200"
  src="/media/images/house.jpg">
  <noscript>
    <img src="/media/images/house.jpg" alt="" />
  </noscript>
</amp-img>

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