<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg" >

  <title>Testcase for mask that can't be resolved</title>

  <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=620144 -->

  <rect width="100%" height="100%" fill="red"/>
  <rect width="100%" height="100%" fill="lime" mask="url(#null)"/>
</svg>