<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<!DOCTYPE HTML>
<html>
<style>
.reftest {
  width: 100px;
  height: 100px;
}

.parent {
  background-color: rgb(255, 255, 0);
  background-blend-mode: screen;
}

.child {
  background-image: url(as-image/green100x100.png);
  background-blend-mode: difference;
}

</style>
<body>
  <div class="reftest parent">
    <div class="reftest child"></div>
  </div>
</body>
</html>