<svg width="300" height="190" viewBox="0 0 300 190"
  xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink">
  
  <defs>
    <g id="cat" stroke-width="2">
      <!-- drawing of cat goes here -->
    </g>

    <filter id="morphology">
      <feMorphology operator="
      erode
      dilate" radius=""/>
    </filter>
  </defs>

  <use xlink:href="#cat"/>
  <text x="75" y="170" style="text-anchor: middle;">Normal</text>

  <use xlink:href="#cat" transform="translate(150,0)"
    style="filter: url(#morphology);"/> 
</svg>