CSS is a lot easier to write and read than clumsy XPath expressions. So when you need to use XPath, you can have Nokogiri help you out on creating it.

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Simply use Nokogiri's xpath_for:

>> Nokogiri::CSS.xpath_for('#foo')
=> ["//*[@id = 'foo']"]
>> Nokogiri::CSS.xpath_for('#foo .bar:nth-of-type(2)')
=> ["//*[@id = 'foo']//*[contains(concat(' ', @class, ' '), ' bar ') and position() = 2]"]

Since XPath is more powerful you may still need to do some hardcore XPath hacking eventually. But at least you don't need to for simple cases.