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BackstopJS automates CSS regression tesing of your responsive web UI by comparing DOM screenshots at various viewport sizes.
**Try the step-by-step tutorial on [http://css-tricks.com/automating-css-regression-testing/](http://css-tricks.com/automating-css-regression-testing/).**
**Try the step-by-step tutorial on [css-tricks.com](http://css-tricks.com/automating-css-regression-testing/).**
Learn more at [http://BackstopJS.org/](http://garris.github.io/BackstopJS/).
