def find(selector)
      nodes = current_frame.getByXPath(selector).map { |node| Node.new(node) }
      @nodes << nodes
      nodes
    end
def find(selector)
      nodes = current_frame.getByXPath(selector).map { |node| Node.new(node) }
      @nodes << nodes
      nodes
    end
@param [HtmlUnit::HtmlPage] page
 Search for nodes which match the given XPath selector.

 @param [String] selector an XPath selector
 @return [Array<Node>] the matched nodes