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I wonder if there is something like this I could use for automated testing of style changes to an app/site. Currently I have to regression test the style manually.

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There are a couple of open source projects for visual regression testing -

Wraith, used by BBC: https://github.com/BBC-News/wraith

Huxley, by Facebook: https://github.com/facebook/huxley

A partner of mine has used http://mogotest.com/ on a production site to add some regression testing for visual changes. You'd have to look into it more specifically, but I believe it worked fairly well.

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