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diff --git a/layout/reftests/svg/clipPath-polygon-01.svg b/layout/reftests/svg/clipPath-polygon-01.svg
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+++ b/layout/reftests/svg/clipPath-polygon-01.svg
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+<!--
+     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 CSS polygon clipPath</title>
+
+  <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=1246741 -->
+
+  <rect width="100%" height="100%" fill="lime"/>
+
+  <!-- test the clip is not too big (or ignored altogether) -->
+  <rect width="100%" height="100%" fill="red"
+        clip-path="polygon(100px 100px, 200px 100px, 200px 200px, 100px 200px)"/>
+  <rect x="98" y="98" width="105" height="105" fill="lime"/>
+
+  <!-- test the clip does not simply make the element not render -->
+  <rect x="300" y="100" width="100" height="100" fill="red"/>
+  <rect x="280" y="80" width="150" height="150" fill="lime"
+        clip-path="polygon(20px 20px, 120px 20px, 120px 120px, 20px 120px)"/>
+
+  <!-- percentage values -->
+  <svg x="100" y="300" width="100" height="100">
+    <rect width="100%" height="100%" fill="red"
+          clip-path="polygon(0 0, 50% 0, 50% 50%, 0 50%)"/>
+    <rect width="55" height="55" fill="lime"/>
+  </svg>
+
+  <!-- mixed absolute and percentage values -->
+  <svg x="300" y="300" width="100" height="100">
+    <rect width="100%" height="100%" fill="red"
+          clip-path="polygon(0 0, 50% 0, 50px 50%, 0 50px)"/>
+    <rect width="55" height="55" fill="lime"/>
+  </svg>
+
+  <!-- mixed other units -->
+  <svg x="500" y="300" width="100" height="100">
+    <rect width="100%" height="100%" fill="red"
+          clip-path="polygon(0 0, 5em 0, 5em 10%, 0 10px)"/>
+    <rect width="5em" height="10%" fill="lime"/>
+  </svg>
+
+  <!-- check fill-rule and clip-rule are ignored for polygon clip-path -->
+  <svg x="500" y="100" width="100" height="100" fill-rule="evenodd" clip-rule="evenodd">
+    <rect width="100%" height="100%" fill="red"
+          clip-path="polygon(0 0, 50px 0, 50px 50px, 0 50px, 0 0, 50px 0, 50px 50px, 0 50px, 0 0)"/>
+    <rect width="55" height="55" fill="lime"/>
+  </svg>
+
+</svg>