@vcl/vcl/responsive-image/demo/example-basic.html

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<div>
  Available width is narrower than image
  <div style="width: 200px;">
    <img class="responsive-image" src="https://picsum.photos/300/300">
  </div>

  <br><br>
  Available width is wider than image
  <div style="width: 400px;">
    <img class="responsive-image" src="https://picsum.photos/300/300">
  </div>
</div>