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Screen scraping has been a focus of engineering for quite some time. Every major language out there has their own library of choice for performing these tasks:
* Ruby hpricot, nokogiri
* Python beautiful-soup, scrapy
* Perl pQuery
* PHP PHP DOM
The challenge with using these libraries is that they all have their own quirks that can make working with HTML, CSS and Javascript challenging.
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http://blog.nodejitsu.com/jsdom-jquery-in-5-lines-on-nodejs