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diff --git a/layout/reftests/svg/smil/transform/rotate-angle-5.svg b/layout/reftests/svg/smil/transform/rotate-angle-5.svg
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+++ b/layout/reftests/svg/smil/transform/rotate-angle-5.svg
@@ -0,0 +1,86 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="setTimeAndSnapshot(101, true)">
+  <script xlink:href="../smil-util.js" type="text/javascript"/>
+  <!-- Tests to-animation behaviour for a lot of undefined situations.
+       SVG 1.1 doesn't define what should happen here but the behaviour we
+       expect is based on other browsers. -->
+  <!-- to animation: rotation from base value -90 to final value 180 -->
+  <g transform="translate(50 50)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+    transform="rotate(-90)">
+      <animateTransform attributeName="transform"
+        type="rotate" to="180" begin="100s" dur="1.5s" fill="freeze"/>
+    </path>
+  </g>
+  <!-- to animation: rotation from base value -810 to final value 990 -->
+  <g transform="translate(150 50)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+    transform="rotate(-810)">
+      <animateTransform attributeName="transform"
+        type="rotate" to="990" begin="100s" dur="2s" fill="freeze"/>
+    </path>
+  </g>
+  <!-- to animation: rotation from base value -180 to final value 90 but with
+       other animations combined.
+
+       What happens here is that the rotation animation can't interpolate from
+       the base value as it's not a rotation transformation, so instead it
+       assumes an underlying zero matrix as the base value. (see next comment)
+   -->
+  <g transform="translate(250 50)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+    transform="rotate(-90) translate(0 50) scale(2)">
+      <animateTransform attributeName="transform"
+        type="rotate" to="180" begin="100s" dur="2s" fill="freeze" additive="sum"/>
+    </path>
+  </g>
+  <!-- to animation: rotate and scale
+       
+       Here again the scale animation can't interpolate from its base value
+       which is of a different type so it assumes a zero matrix NOT an identity
+       matrix (this is what the SVG WG have decided in the SVGT1.2 Tiny test
+       suite).
+   -->
+  <g transform="translate(50 150) rotate(90)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+    transform="scale(2)">
+      <animateTransform attributeName="transform"
+        type="rotate" to="180" begin="100s" dur="1s" fill="freeze" additive="sum"/>
+      <animateTransform attributeName="transform"
+        type="scale" to="2" begin="100s" dur="2s" fill="freeze" additive="sum"/>
+    </path>
+  </g>
+  <!-- to animation: translate and rotate
+       
+       Likewise here we end up rotating from 0 to 180 because we can't
+       interpolate from the underlying translation transformation.
+   -->
+  <g transform="translate(150 150)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+    transform="rotate(-90) translate(0 50) scale(2)">
+      <animateTransform attributeName="transform"
+        type="translate" to="0" begin="100s" dur="1s" fill="freeze" additive="sum"/>
+      <animateTransform attributeName="transform"
+        type="rotate" to="180" begin="100s" dur="2s" fill="freeze" additive="sum"/>
+    </path>
+  </g>
+  <!-- The following are from the reference image -->
+  <g transform="translate(250 150)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+      transform="rotate(90)"/>
+  </g>
+  <g transform="translate(50 250)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+      transform="rotate(90)"/>
+  </g>
+  <g transform="translate(150 250)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+      transform="rotate(90)"/>
+  </g>
+  <g transform="translate(250 250)">
+    <path d="M-2 50h4v -90h4l -6 -10 -6 10h4z" fill="blue"
+      transform="rotate(90)"/>
+  </g>
+</svg>