urned.

        The result is cached, so subsequent lookups don't have to
        perform the O(n) nearest neighbor search.

        See the `W3C Cascading Style Sheet, Level 1
        <http://www.w3.org/TR/1998/REC-CSS2-19980512/>`_ documentation
        for a description of the font finding algorithm.

        .. _fontconfig patterns:
           https://www.freedesktop.org/software/fontconfig/fontconfig-user.html
        c