docs: function screenSize() {
          var w = window.outerWidth || html.clientWidth;
  
          // remove earlier widths
          html.className = html.className.replace(/ (w|lt)-\d+/g, "");
  
          // add new ones
          pushClass("w-" + Math.round(w / 100) * 100);
  
          each(conf.screens, function(width) {
              if (w <= width) { pushClass("lt-" + width); }
          });
  
          api.feature();
      }