visual-regression-testing

Visual regression testing captures screenshots of UI components and pages, then compares them across versions to detect unintended visual changes. This automated approach catches CSS bugs, layout issues, and design regressions that traditional functional tests miss. Minimal working example: Detailed implementations in the references/ directory: - Overview - When to Use - Quick Start - Reference Guides - Best Practices - Detecting CSS regression bugs - Validating responsive design across viewports - Testing across different browsers - Verifying component visual consistency - Catching layout shifts and overlaps - Testing theme changes - Validating design system components - Reviewing visual changes in PRs - Hide or mock dynamic content (timestamps, ads) - Test across multiple viewports - Wait for animations and images to load - Use consistent viewport sizes - Disable animations during capture - Test interactive states (hover, focus) - Review diffs carefully before approving - Store baselines in version control - Test pages with constantly changing content - Ignore small legitimate differences - Skip responsive testing - Forget to update baselines after design changes - Test pages with random data - Use overly strict thresholds (0% diff) - Skip browser/device variations - Commit unapproved diffs