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+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg id="svg-root"
+  xmlns="http://www.w3.org/2000/svg"
+  xmlns:xlink="http://www.w3.org/1999/xlink">
+
+  <g id="testmeta">
+    <title>SVG Filter Chains: Default Filter Primitive Subregion</title>
+    <link rel="copyright"
+          href="http://www.w3.org/Graphics/SVG/Test/Copyright"/>
+    <link rel="license"
+          href="http://www.w3.org/Consortium/Legal/2008/03-bsd-license.html"/>
+    <link rel="author"
+          title="Max Vujovic"
+          href="mailto:mvujovic@adobe.com"/>
+    <link rel="help"
+          href="http://dev.w3.org/fxtf/filters/#FilterPrimitiveSubRegion"/>
+    <link rel="match"
+          href="default-subregion-ref.svg" />
+    <metadata class="flags">namespace svg</metadata>
+    <desc class="assert">
+      In an SVG filter chain, this test verifies that the default filter
+      primitive subregion is equal to the filter region. If the test passes,
+      you should see a blurred green square.
+    </desc>
+  </g>
+
+  <g id="test-body-content">
+    <filter id="f1" x="100" y="100" width="100" height="100" filterUnits="userSpaceOnUse">
+      <!-- Fill a 100x100 square with green. -->
+      <feFlood flood-color="green"/>
+    </filter>
+    <filter id="f2" x="50" y="50" width="200" height="200" filterUnits="userSpaceOnUse">
+      <!--
+        This feGaussianBlur primitive blurs the 100x100 green square from the
+        previous filter. It does not explicitly define a filter primitive
+        subregion, so its subregion should equal the filter region. The filter
+        region has plenty of space for the blur outsets, so the blur should not
+        appear clipped. If the blur incorrectly uses a primitive subregion or
+        filter region from a previous filter, the blur may appear clipped.
+      -->
+      <feGaussianBlur stdDeviation="10"/>
+    </filter>
+    <rect x="100" y="100" width="100" height="100" filter="url(#f1) url(#f2)" fill="red"/>
+  </g>
+</svg>