iv>
         <script type="text/javascript">
            var invalid_ellipse_position_tests = [
                {"name": "ellipse(at foo)"},
                {"name": "ellipse(at 50)"},
                {"name": "ellipse(at 10px 20px 30px)"},
                {"name": "ellipse(at 20% 30% 40%)"},
                {"name": "ellipse(at 20px, 30px)"},
                {"name": "ellipse(at 20%, 30%)"},
                {"name": "ellipse(at 20px, 30px, 40px)"},
                {"name": "ellipse(at 20%, 30%, 40%)"},
   