visitPage(node) {
    var buf = this.indent + '@page' + (node.selectors.length ? ' ' + node.selectors.join(', ') : '');
    buf += '\n';
    ++this.indents;
    for (var i = 0, len = node.declarations.length; i < len; ++i) {
      buf += this.visitDeclaration(node.declarations[i]);
    }
    --this.indents;
    return buf;
  }
Visit Page `node`.`

@param {Page} node
@return {String}
@api private