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I would love to see this integrated with something like GitHub's image diff presenter.

Example: https://github.com/cameronmcefee/Image-Diff-View-Modes/commi...

Information: https://github.com/blog/817-behold-image-view-modes

You would just need to run a script that runs phantomjs (casperjs and you can run tests at the same time) and saves screenshots of different pages in your app. Then it checks in the images (possibly in a different repo that is just for comparing screenshots). This could be done as part of continuous integration. Whenever deploying one could generate a compare view with the last deployed revision.

... I had a prototype that did that.

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