<!-- Example taken from MDN -->
<svg viewBox="-10 -10 220 120" xmlns="http://www.w3.org/2000/svg">
  <!-- Default value for fill-rule -->
  <polygon
    fill-rule="nonzero"
    stroke="red"
    points="50,0 21,90 98,35 2,35 79,90" />

  <!--
  The center of the shape has two
  path segments (shown by the red stroke)
  between it and infinity. It is therefore
  considered outside the shape, and not filled.
  -->
  <polygon
    fill-rule="evenodd"
    stroke="red"
    points="150,0 121,90 198,35 102,35 179,90" />
</svg>