def gravatar(email_address, cls='', size=30, ssl_enabled=True):

    """return html element of the gravatar

    This method will return an <img> with the resolution double the size (for

    retina screens) of the image. If the url returned from gravatar_url is

    empty then we fallback to using an icon.

    """

    src = gravatar_url(email_address, size*2, ssl_enabled)

    #  here it makes sense to use style="width: ..." (instead of, say, a

    # stylesheet) because we using this to generate a high-res (retina) size

    tmpl = """<img alt="gravatar" class="{cls}" style="width: {size}px; height: {size}px" src="{src}"/>"""

    tmpl = tmpl.format(cls=cls, size=size, src=src)

    return literal(tmpl)