" src="data:image/svg+xml,%3Csvg viewBox='0 0 100 10' width='100px' xmlns='http://www.w3.org/2000/svg' %3E%3Crect width='100%' height='100%' style='fill:rgb(0,255,0);'/%3E%3C/svg%3E"
  data-expected-width="138" data-expected-height="42" data-offset-y="151" data-offset-x="259"
  >
</div>
<!-- Viewbox + svg height. Has aspect_ratio and height. Width is scaled -->
<div class="container">
  <img class="target" src="data:image/svg+xml,%3Csvg viewBox='0 0 100 10' height='20px' xmlns='http://www.w3.org/2000/svg' %