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<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/kirkjufell.jpg" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/kirkjufell.jpg 1x, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/kirkjufell@2x.jpg 2x" alt="Photograph of a blurred waterfall in Iceland with a conical mountain behind it">
  <figcaption>Example of <code>Nx srcset</code> syntax: 196DPI+ screens will recieve the 2x image, regardless of display size; all others will recieve 1x version</figcaption>

<figure class="retina">
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/skogafoss.jpg" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/skogafoss.jpg 1000w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/skogafoss@2x.jpg 2000w" alt="Photograph of a tiny human figure in a red rainjacket drawfed by the scale of the Skógafoss waterfall in Iceland">
  <figcaption>Example of of <code>Nw srcset</code> syntax: viewports more than 2000 <em>device</em> pixels wide will recieve the 2x version; those under 1000 will recieve 1x.</figcaption>
              body { 
  background: #223; color: #fff; 
  font-family: Avenir, sans-serif;
figure { 
  width: 60%; margin: 0 auto;
  margin-bottom: 2rem; 
figure img { 
  width: 100%; 
  height: auto; 
  margin-bottom: 1rem;
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