fails:CGI::HtmlExtension#caption when passed a String returns a 'caption'-element, using the passed String for the 'align'-attribute
fails:CGI::HtmlExtension#caption when passed a String includes the passed block's return value when passed a block
fails:CGI::HtmlExtension#caption when passed a Hash returns a 'caption'-element, using the passed Hash for attributes
fails:CGI::HtmlExtension#caption when passed a Hash includes the passed block's return value when passed a block
