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Common Web Visual Testing

Community
HoangNguyen0403
common-web-visual-testing

Standardizes visual audits, responsive design, and behavioral testing for web apps. Use to verify a web UI fix or cross-browser behavior; defer backend API refactors, Playwright installation/tooling setup, and Appium/mobile automation.

Overview

PublisherHoangNguyen0403
Repositoryagent-skills-standard
Skill namecommon-web-visual-testing
Stars
573
Forks
166
Bundled files
4
LicenseMIT
Links
Skill sourceRepositoryHomepage
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • 4 bundled files

    Scripts, templates, and references the model can read while it works. Files are read-only and never executed.

  • Open source

    Published by HoangNguyen0403 on GitHub. Read the source before you install it.

Installation

Install the Common Web Visual Testing AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
    https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/.agents/skills/common/common-web-visual-testing
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git /tmp/agent-skills-standard
mkdir -p .claude/skills
cp -r /tmp/agent-skills-standard/.agents/skills/common/common-web-visual-testing .claude/skills/common-web-visual-testing
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Common Web Visual Testing in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Common Web Visual Testing on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Common Web Visual Testing is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

🌐 Web Visual & Behavioral Testing

Priority: P1 (HIGH)

[!IMPORTANT] Tier 2 (Methodology): Strategy web UI/UX audit. Tier 3 (Domain): Responsive, A11y (WCAG), Browser Engine quirk.

🧪 Testing Mindset (Comparative Audit)

Visual test best as Comparative Audit loop:

  1. Baseline (Before): Capture snapshot --aria + screenshot prod/main.
  2. Implementation (After): Capture same local/feature.
  3. Audit: Compare state for regression, CLS, Aria drift.

Responses must label the two captures as Before and After (or Baseline and Fixed) and include the diff and neighboring-element side-effect check.

📋 Scenario Matrix

Change TypeScenarios to Run
CSS/LayoutResponsive Audit + Hover + CLS Check
Forms/InputValidation Msg + Focus State + Error Boundary
NavigationURL Sync + Sticky Header + Back-Button Persistence
Assets/FontsLazy Load + Icon Check + LCP Audit
AccessibilityTab Order + Aria-Snapshot + Color Contrast

🚫 Anti-Patterns

  • Single-Viewport: Never verify Desktop only. Check Mobile (375px) + Tablet (768px).
  • Ignore Layout Shift: Check loading state (skeleton) → no page jump.
  • Unmasked Dynamic: MUST mask timestamp/balance via --mask or JS (opacity: 0). Avoid "False Regression".
  • Blind Assertion: Use playwright-cli snapshot --aria (CLI) or browser_snapshot (Playwright MCP) verify state before done.

📁 Evidence

Before/After pairs live in .playwright-cli/<session>/ as <AC|step>-before.png / <AC|step>-after.png plus matching .aria.txt. Driver rung and dir go in the walkthrough driver: / evidence_dir: lines.

  • External Dependency: Mock/bypass 3rd-party (Chat, Analytics) → prevent flakiness.

🔗 References

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Common Web Visual Testing AI skill do?

Standardizes visual audits, responsive design, and behavioral testing for web apps. Use to verify a web UI fix or cross-browser behavior; defer backend API refactors, Playwright installation/tooling setup, and Appium/mobile automation.

Why use Common Web Visual Testing on TypingMind?

Because you install it once and use it with any model. Common Web Visual Testing is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Common Web Visual Testing in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/.agents/skills/common/common-web-visual-testing. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Common Web Visual Testing?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Common Web Visual Testing?

As many as you like. As long as a model supports skills, you can use Common Web Visual Testing with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Common Web Visual Testing AI skill free?

Yes. It is published on GitHub by HoangNguyen0403 under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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