pct-marker-ref.html

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<!doctype html>

<html>

  <style>

    svg {

      width: 100%;

      display: block;

  </style>

  <div style="width: 200px; overflow: hidden">

    <svg height="120">

      <defs>

        <marker id="m"

                markerUnits="userSpaceOnUse"

                markerWidth="20%"

                markerHeight="40"

                refX="0"

                refY="0">

          <rect width="4000" height="40" fill="green"/>

        </marker>

      </defs>

      <path d="M0 50 L1 50" marker-start="url(#m)"/>

    </svg>

  </div>

</html>