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visual-diff

Detect visual regressions in web UIs via Playwright screenshot comparisons.

115|13|Updated Mar 24, 2026
Search Tags:#playwright#ui testing#visual regression#screenshot comparison#frontend qa#css validation#pre-deploy testing
One-click install
npx skills add https://github.com/Houseofmvps/ultraship --skill visual-diff-houseofmvps
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: visual-diff
Source: https://github.com/Houseofmvps/ultraship/tree/main/skills/visual-diff
Command: npx skills add https://github.com/Houseofmvps/ultraship --skill visual-diff-houseofmvps

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill eliminates the risk of undetected visual bugs slipping into production after CSS updates, component refactors, or layout changes, which are often missed by manual testing and standard code reviews.

Core Features & Use Cases

  • Cross-Viewport Screenshot Comparison: Automatically captures before/after screenshots of web pages across desktop, tablet, and mobile viewports to spot layout shifts, color changes, typography issues, and responsive breaks.
  • Interactive State Validation: Tests hover, click, form, dark mode, loading, and error states to catch regressions in dynamic UI elements that static screenshots might miss.
  • Use Case Example: After updating a global CSS variable for your e-commerce site, use this Skill to compare screenshots of your homepage, product page, and checkout flow to confirm no unintended layout or style breaks occurred.

Quick Start

Use the visual-diff skill to run a visual regression check on your staging site's homepage and dashboard after you update the global button styles, and provide a report of any detected visual differences with severity ratings and suggested fixes.

Frequently Asked Questions about visual-diff

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect UI visual regressions after a CSS refactor?▼

UI visual regression detection captures before and after screenshots across desktop, tablet, and mobile viewports to identify layout shifts, color changes, and typography issues caused by CSS refactors. It compares these screenshots to generate actionable reports with severity ratings and fix suggestions.

Can I test interactive UI states like hover and dark mode for visual bugs?▼

Yes, visual regression testing validates interactive UI states including hover, click, form, dark mode, loading, and error states. This catches dynamic regressions that static screenshot comparisons might miss during component modifications.

Do I need Playwright to run pre-deploy visual regression checks?▼

Yes, Playwright browser automation is required to capture before and after screenshots for pre-deploy visual regression validation. It drives the browser interactions needed to compare visual differences and generate actionable regression reports.

What is the best way to catch unintended layout shifts across different viewports?▼

Cross-viewport screenshot comparison is the best way to catch unintended layout shifts, automatically capturing web pages across desktop, tablet, and mobile viewports. This process spots responsive breaks and style changes to generate actionable regression reports.

Why should I use automated screenshot comparison instead of manual UI testing?▼

Automated screenshot comparison eliminates the risk of undetected visual bugs slipping into production after layout changes, which are often missed by manual testing. It generates actionable regression reports with severity ratings and fix suggestions for immediate resolution.

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