docs: function ( root ) {
      var walker = new TreeWalker( root, SHOW_TEXT, function () {
              return true;
          }, false ),
          parent, node, index;
      while ( node = walker.nextNode() ) {
          while ( ( index = node.data.indexOf( ZWS ) ) > -1 ) {
              if ( node.length === 1 ) {
                  do {
                      parent = node.parentNode;
                      parent.removeChild( node );
                      node = parent;
                      walker.currentNode = parent;
                  } while ( isInline( node ) && !getLength( node ) );
                  break;
              } else {
                  node.deleteData( index, 1 );
              }
          }
      }
  }