CSS Testing – Visual Regression & Linting

Automated testing ensures style consistency.

• Stylelint lints CSS for errors, unused selectors, and conventions.
• BackstopJS, Percy, or Chromatic provide visual regression snapshots.
• CI integration (GitHub Actions) can fail builds on lint errors.

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Example: Simple stylelint config (.stylelintrc.json)

{
  "extends": "stylelint-config-standard",
  "rules": { "color-no-invalid-hex": true, "max-nesting-depth": 3 }
}