"Speaker: Daniel Vanderkam Visual diffs are a great way to check for regressions on web sites which may be missed by unit tests. In this talk you'll learn how to run end-to-end tests on your client and server web libraries using a tool called dpxdt. I'll also show how you can combine it with web-based diff tools like ""git webdiff"" to quickly and confidently iterate on web tools. Slides can be found at: https://speakerdeck.com/pycon2015 and https://github.com/PyCon/2015-slides"