 y: 10px;
    mask-image: url(support/blue-100x50-transparent-100x50.svg),
                url(support/transparent-100x50-blue-100x50.svg);
  }

  rect.add {
    x: 10px;
    mask-composite: add;
  }

  rect.subtract {
    x: 120px;
    mask-composite: subtract;
  }

  rect.intersect {
    x: 230px;
    mask-composite: intersect;
  }

  rect.exclude {
    x: 340px;
    mask-composite: exclude;
  }
</style>
<svg width="440">
  <rect class="add"/>
  <rect class="subtract"/>
  <rect class="intersect"/>
  <rect