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webapp-testing

Test local web applications with Playwright browser automation, screenshots, and UI debugging.

5|Updated Jun 13, 2026
Search Tags:#accessibility#python#browser automation#web testing#playwright#e2e testing#visual regression
One-click install
npx skills add https://github.com/PatriotAi/ai-lab --skill webapp-testing-patriotai
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: webapp-testing
Source: https://github.com/PatriotAi/ai-lab/tree/main/melania-skills-ecosystem/skills/webapp-testing
Command: npx skills add https://github.com/PatriotAi/ai-lab --skill webapp-testing-patriotai

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires playwright, Pillow, numpy, and includes scripts (resource) and references (resource) components.

What problem does it solve? Manually verifying frontend behavior, debugging UI issues, and checking responsive layouts in local web applications is slow and error-prone. This Skill automates browser-based testing with Playwright so you can validate functionality, capture screenshots, and inspect browser logs without writing boilerplate from scratch. ## Core Features & Use Cases - Playwright Browser Automation: Launch headless Chromium, navigate pages, wait for network idle, and interact with elements using descriptive selectors. - Visual Regression & Screenshots: Capture baseline and current screenshots, then compare them pixel-by-pixel to detect unintended UI changes. - Accessibility, Mobile & API Testing: Check ARIA labels and tab order, emulate mobile/tablet/desktop viewports, and call APIs through Playwright's built-in request client. - Use Case: You are developing a local app on port 5173 and a button stops responding. The Skill starts the server via the helper script, inspects the rendered DOM after network idle, identifies the correct selector, and produces a reproducible Playwright test script. ## Quick Start Ask the assistant to test your local web application running on localhost with Playwright and capture a screenshot of the result.

Frequently Asked Questions about webapp-testing

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

FAQPage Schema
How do I test a local web application with Playwright?▼

Launch headless Chromium with sync_playwright, navigate to your localhost URL, and call page.wait_for_load_state('networkidle') before interacting. Use the with_server.py helper to start your dev server automatically alongside the automation script.

How to do visual regression testing with Playwright screenshots?▼

Capture a baseline screenshot with page.screenshot, then compare it against a current screenshot using PIL's ImageChops to compute the pixel difference percentage. Playwright also offers expect(page).to_have_screenshot with masking for dynamic elements.

Why does Playwright DOM inspection return wrong selectors?▼

Inspecting the DOM before network idle gives incomplete results because JavaScript has not finished rendering on dynamic apps. Always wait for page.wait_for_load_state('networkidle') before capturing screenshots or reading selectors.

Can Playwright test APIs without a separate HTTP library?▼

Yes, Playwright includes a built-in API client via page.request that supports GET and POST calls with authentication headers and JSON bodies. You can assert on status codes and parse response JSON directly in the same test script.

When should I not use browser automation for testing?▼

Avoid browser automation for non-browser unit tests or backend logic without a UI, since those run faster and more reliably with standard test frameworks. This approach is scoped to automated Playwright tests, not collaborative interactive browsing.

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