# File lib/maruku/ext/math/to_html.rb, line 149
      def to_html_eqref
        unless eq = self.doc.eqid2eq[self.eqid]
          maruku_error "Cannot find equation #{self.eqid.inspect}"
          return xtext("(eq:#{self.eqid})")
        end

        a = xelem('a')
        a['class'] = 'maruku-eqref'
        a['href'] = "#eq:#{self.eqid}"
        a << xtext("(#{eq.num})")
        a
      end