oveAttr('href');

      // add orcid ids
      $('.authors-affiliations').find('.author').each(function(i, el) {
        var orcid_id = front_matter.authors[i].orcidID;
        if (orcid_id) {
          var a = $('<a></a>');
          a.attr('href', 'https://orcid.org/' + orcid_id);
          var img = $('<img></img>');
          img.addClass('orcid-id');
          img.attr('alt', 'ORCID ID');
          img.attr('src','data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQB