DrupalCon Los Angeles 2015: CI for CSS: Creating a Visual Regression Testing Workflow

This talk focuses on automated perceptual diffing, a method for capturing, tracking, and analyzing screenshots to identify unexpected front-end changes that can indicate larger issues. The speaker discusses the challenges of rapid development cycles, extensive page counts, and developer fatigue, which complicate the detection of even obvious visual mistakes. The session also covers setting up a basic workflow for visual diffing and expanding it with headless and full-browser testing techniques. Attendees will learn how to automate visual diffing processes to prevent unintended CSS changes from reaching production environments.