<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg">
  <title>Reference for clip-path, filter, mask and opacity applying to marker elements</title>
  <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=874507 -->
  <defs>
    <clipPath id="c">
      <circle cx="50" cy="50" r="50"/>
    </clipPath>
    <filter id="f">
      <feColorMatrix type="saturate" values="0"/>
    </filter>
    <mask id="m">
      <circle cx="50" cy="50" r="50" fill="white"/>
    </mask>
    <marker id="m-clip-path" markerWidth="100" markerHeight="100" fill="green">
      <g clip-path="url(#c)">
        <rect width="100" height="100"/>
      </g>
    </marker>
    <marker id="m-filter" markerWidth="100" markerHeight="100" fill="green">
      <g filter="url(#f)">
        <rect width="100" height="100"/>
      </g>
    </marker>
    <marker id="m-mask" markerWidth="100" markerHeight="100" fill="green">
      <g mask="url(#m)">
        <rect width="100" height="100"/>
      </g>
    </marker>
    <marker id="m-opacity" markerWidth="100" markerHeight="100" fill="green">
      <g opacity="0.5">
        <rect width="100" height="100"/>
      </g>
    </marker>
  </defs>

  <line x1="10" y1="10" x2="11" y2="10" marker-start="url(#m-clip-path)"/>
  <line x1="120" y1="10" x2="121" y2="10" marker-start="url(#m-filter)"/>
  <line x1="230" y1="10" x2="231" y2="10" marker-start="url(#m-mask)"/>
  <line x1="340" y1="10" x2="341" y2="10" marker-start="url(#m-opacity)"/>
</svg>