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Tangential, but does anyone know what Github uses to match their css and html classes in the integration suite? I often find that I don't clean up my css as the free as I should because I'm scared of breaking another page by mistake, so something that tells me "you're really not using this anywhere anymore" would be great.

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I don't know what Github uses, but where I work, we do screenshot testing. We have PhantomCSS[0], which is a helper on top of CasperJs that visits pages, takes screenshots and compares them. There are a lot of other tools, Huxley and Selenium come to my mind, that do the same stuff. Even Facebook[1] tests this way.

[0]: https://github.com/Huddle/PhantomCSS [1]: https://www.youtube.com/watch?v=VkTCL6Nqm6Y

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