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diff --git a/layout/reftests/svg/smil/anim-gradient-attr-presence-01.svg b/layout/reftests/svg/smil/anim-gradient-attr-presence-01.svg
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@@ -0,0 +1,193 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg"
+  xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 200 900">
+  <!-- Bug 608161 - SVG SMIL: Don't use HasAttr to test for presence of animated
+       attributes.
+       
+       Test animating gradient attributes doesn't rely on the presence of
+       attributes in the DOM, but also correctly detects attributes set by
+       animation.
+
+       The format of each test is that we have a base gradient named
+       (attName)Ref which does NOT specify the attribute under test, but instead
+       sets the attribute to a non-default value using animation.
+
+       Then we have a referencing gradient named (attName) that refers to the
+       base gradient and also does NOT specify the attribute under test.
+
+       When we go to look up the attribute under test we begin at (attName),
+       notice the attribute isn't specified (either in the DOM or by animation),
+       then go to (attName)Ref and detect that the attribute is specified there
+       by animation and use that value.
+
+       To the right of each test we also include a rect that directly references
+       (attName)Ref. The two rectangles should be identical but prior to fixing
+       this bug they were not.
+       -->
+  <!-- 1. gradientUnits: defaults to objectBoundingBox -->
+  <defs>
+    <linearGradient xlink:href="#gradientUnitsRef" id="gradientUnits"/>
+    <linearGradient id="gradientUnitsRef" x1="0" y1="0" x2="100" y2="0">
+      <set attributeName="gradientUnits" to="userSpaceOnUse"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </linearGradient>
+  </defs>
+  <rect width="100" height="100" fill="url(#gradientUnits)"/>
+  <g transform="translate(100)">
+    <rect width="100" height="100" fill="url(#gradientUnitsRef)"/>
+  </g>
+  <!-- 2. gradientTransform: defaults to identity -->
+  <defs>
+    <linearGradient xlink:href="#gradientTransformRef" id="gradientTransform"/>
+    <linearGradient id="gradientTransformRef">
+      <animateTransform attributeName="gradientTransform" type="rotate"
+        values="90 0.5 0.5" fill="freeze"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </linearGradient>
+  </defs>
+  <g transform="translate(0 100)">
+    <rect width="100" height="100" fill="url(#gradientTransform)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#gradientTransformRef)"/>
+    </g>
+  </g>
+  <!-- 3. x1: defaults to 0%
+          x2: defaults to 100% -->
+  <defs>
+    <linearGradient xlink:href="#x1x2Ref" id="x1x2"/>
+    <linearGradient id="x1x2Ref">
+      <set attributeName="x1" to="40%"/>
+      <set attributeName="x2" to="60%"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </linearGradient>
+  </defs>
+  <g transform="translate(0 200)">
+    <rect width="100" height="100" fill="url(#x1x2)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#x1x2Ref)"/>
+    </g>
+  </g>
+  <!-- 4. y1: defaults to 0%
+          y2: defaults to 0% -->
+  <defs>
+    <linearGradient xlink:href="#y1y2Ref" id="y1y2"/>
+    <linearGradient id="y1y2Ref" x2="0%">
+      <set attributeName="y1" to="40%"/>
+      <set attributeName="y2" to="60%"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </linearGradient>
+  </defs>
+  <g transform="translate(0 300)">
+    <rect width="100" height="100" fill="url(#y1y2)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#y1y2Ref)"/>
+    </g>
+  </g>
+  <!-- 5. cx: defaults to 50%
+          cy: defaults to 50% -->
+  <defs>
+    <radialGradient xlink:href="#cxcyRef" id="cxcy"/>
+    <radialGradient id="cxcyRef">
+      <set attributeName="cx" to="0%"/>
+      <set attributeName="cy" to="100%"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </radialGradient>
+  </defs>
+  <g transform="translate(0 400)">
+    <rect width="100" height="100" fill="url(#cxcy)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#cxcyRef)"/>
+    </g>
+  </g>
+  <!-- 6. r: defaults to 50% -->
+  <defs>
+    <radialGradient xlink:href="#rRef" id="r"/>
+    <radialGradient id="rRef">
+      <set attributeName="r" to="100%"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </radialGradient>
+  </defs>
+  <g transform="translate(0 500)">
+    <rect width="100" height="100" fill="url(#r)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#rRef)"/>
+    </g>
+  </g>
+  <!-- 7. fx: defaults to cx
+          fy: defaults to cy -->
+  <defs>
+    <radialGradient xlink:href="#fxfyRef" id="fxfy"/>
+    <radialGradient id="fxfyRef">
+      <set attributeName="fx" to="20%"/>
+      <set attributeName="fy" to="80%"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </radialGradient>
+  </defs>
+  <g transform="translate(0 600)">
+    <rect width="100" height="100" fill="url(#fxfy)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#fxfyRef)"/>
+    </g>
+  </g>
+  <!-- 8. spreadMethod: defaults to pad -->
+  <defs>
+    <linearGradient xlink:href="#spreadMethodRef" id="spreadMethod"/>
+    <linearGradient id="spreadMethodRef" x1="50%">
+      <set attributeName="spreadMethod" to="reflect"/>
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </linearGradient>
+  </defs>
+  <g transform="translate(0 700)">
+    <rect width="100" height="100" fill="url(#spreadMethod)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#spreadMethodRef)"/>
+    </g>
+  </g>
+  <!-- 9. xlink:href
+    This attribute is not affected by bug 608161 but we test it here for
+    completeness.
+    -->
+  <defs>
+    <linearGradient id="xlink">
+      <set attributeName="xlink:href" to="#xlinkRef"/>
+    </linearGradient>
+    <linearGradient id="xlinkRef">
+      <stop offset="0%" stop-color="#F60" />
+      <stop offset="100%" stop-color="#FF6" />
+    </linearGradient>
+  </defs>
+  <g transform="translate(0 800)">
+    <rect width="100" height="100" fill="url(#xlink)"/>
+    <g transform="translate(100)">
+      <rect width="100" height="100" fill="url(#xlinkRef)"/>
+    </g>
+  </g>
+  <!-- We were getting random but very minor anti-aliasing differences on OSX
+       and OSX64 along the edges of these gradients so we draw a thick stroke
+       over all the edges. -->
+  <path stroke="black" stroke-width="3" stroke-linecap="square" fill="none"
+    d="M0 0H200V900H0V0
+       M0 100H200
+       M0 200H200
+       M0 300H200
+       M0 400H200
+       M0 500H200
+       M0 600H200
+       M0 700H200
+       M0 800H200
+       M0 900H200
+       M100 0V900"/>
+  <!-- If adding more tests here, be sure to update the viewBox on the root svg
+       element -->
+</svg>