Backport upstream commit https://github.com/WebKit/MotionMark/commit/1e1931505bd764a8268b65d913b566145a9a3388
diff --git b/resources/extensions.js a/resources/extensions.js
index 69fe374ee7ebb..fb9d500877e38 100644
--- b/resources/extensions.js
+++ a/resources/extensions.js
@@ -371,7 +371,7 @@ UnitBezier = Utilities.createClass(
 
     sampleY: function(t)
     {
-        return ((this._a.y * t + this._b.y) * t + this._c.y) * t;kkkj
+        return ((this._a.y * t + this._b.y) * t + this._c.y) * t;
     },
 
     sampleDerivativeX: function(t)
