Visual Regression for CMS Upgrades

Compares two deployed environments (e.g. production vs an upgraded UAT site) screenshot-by-screenshot and emits a single self-contained HTML report classifying every page as PASS / WARN / FAIL.

Use this whenever you need to prove — or disprove — that an upgrade looks identical to the live site.

When to use

Trigger phrases:

• "does the upgrade look the same as prod"
• "compare prod and UAT visually"
• "visual regression check"
• "screenshot diff between two sites"
• "the layout looks different after the upgrade"
• "verify the SilverStripe 4 → 5 upgrade visually"
• "does it look identical"

Prerequisites