'An Element with an attr tag renders the vaule of its attr tag as an
attribute of its containing tag.'

def test_attrRendering(self):

    element = Element(loader=XMLString('<a    xmlns:t="http://twistedmatrix.com/ns/twisted.web.template/0.1"><t:attr    name="href">http://example.com</t:attr>Hello,    world.</a>'))
    return self.assertFlattensTo(element, '<a    href="http://example.com">Hello,    world.</a>')
