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test.rb #
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require 'nokogiri'
 
doc  = Nokogiri::HTML DATA
node = doc.at('div')
(node >> 'a').map { |n| n.text } # => ["child of div"]
 
__END__
<html>
  <body>
    <div>
      <a>child of div</a>
      <p>
        <a>child of p</a>
      </p>
    </div>
  </body>
</html>