class MyCircle(object):
    
    def _repr_html_(self):
        return "&#x25CB; (<b>html</b>)"

    def _repr_svg_(self):
        return """<svg width="100px" height="100px">
           <circle cx="50" cy="50" r="20" stroke="black" stroke-width="1" fill="blue"/>
        </svg>"""
    
    def _repr_latex_(self):
        return r"$\bigcirc \LaTeX$"

    def _repr_javascript_(self):
        return "alert('I am a circle!');"