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diff --git a/layout/reftests/svg/smil/anim-change-display-none-for-ancestor-elem.html b/layout/reftests/svg/smil/anim-change-display-none-for-ancestor-elem.html
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+++ b/layout/reftests/svg/smil/anim-change-display-none-for-ancestor-elem.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>Test animation in a subtree that dynamically becames 'display:none'</title>
+  </head>
+  <body style="background-color: lime;">
+    <div id="target">
+      <svg>
+        <rect width="100%" height="100%" fill="blue">
+          <animate attributeName="fill" from="brown" to="red" dur="100s"/>
+        </rect>
+      </svg>
+    </div>
+    <script>
+      document.addEventListener('MozReftestInvalidate', function() {
+        var target = document.getElementById("target");
+        target.style.display = "none";
+
+        requestAnimationFrame(function(time) {
+          document.documentElement.removeAttribute("class");
+        });
+      });
+    </script>
+  </body>
+</html>