<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<!--
     This test verifies that feTurbulence creates a noise image that remains
     anchored at the user space origin, not the filter region origin. The filter
     region should act as a viewport into the anchored noise image.
-->
<svg xmlns="http://www.w3.org/2000/svg">
  <!--
    Place the filtered rect at (75, 75) in user space.
    Make the filter region start at (-25, -25) from the top left corner of the rect.
    Thus, the filter output should start at (50, 50).
  -->
  <filter id="f" x="-25%" y="-25%" width="100%" height="100%">
    <feTurbulence type="turbulence" baseFrequency="0.01" numOctaves="1"></feTurbulence>
  </filter>
  <rect x="75" y="75" width="100" height="100" filter="url(#f)"/>
</svg>