import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/reftests/svg/smil/anim-use-length-01.svg

@@ -0,0 +1,38 @@
+<!--
+     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"
+     class="reftest-wait"
+     onload="setTimeAndSnapshot(1, true)">
+  <title>Test animation of the "width" &amp; "height" &lt;length&gt; attributes on the "use" element</title>
+  <script xlink:href="smil-util.js" type="text/javascript"/>
+
+  <defs>
+    <symbol id="sym1">
+      <rect width="100" height="50" fill="lime" />
+    </symbol>
+    <symbol id="sym2">
+      <rect y="100" width="100" height="50" fill="red" />
+    </symbol>
+  </defs>
+  <rect width="100%" height="100%" fill="lime"/>
+  <rect width="100" height="50" fill="red" />
+  <use xlink:href="#sym1" height="100%" width="0%">
+    <animate attributeName="width"
+     calcMode="linear"
+     begin="0s" dur="2s"
+     from="0%" to="200%"
+     fill="freeze"/>
+  </use>
+  <use xlink:href="#sym2" height="100%" width="200%">
+    <animate attributeName="width"
+     calcMode="linear"
+     begin="0s" dur="2s"
+     from="200%" to="0%"
+     fill="freeze"/>
+  </use>
+  <rect y="100" width="100" height="50" fill="lime" />
+
+</svg>