Technical & DevelopmentAdvanced

webapp-testing

Interact with and test web applications using Playwright.

Developer Setup

Setup & Installation

bash

npx skills add https://github.com/anthropics/skills --skill webapp-testing

npx skills add https://github.com/anthropics/skills --skill webapp-testing

Or paste this URL into your assistant to install:

https://github.com/anthropics/skills/tree/main/skills/webapp-testing View on GitHub

Overview

What This Skill Does

Automates end-to-end user interface testing and behavior validation for web applications. It runs headless browser checks, handles page interactions, and asserts layout correctness.

Application

When to use this Skill

Validating form submissions, clicks, and page redirection logic
Testing responsive layouts across multiple screen viewport sizes
Writing automated regression tests for critical user flows
Diagnosing console errors, loading latency, and API mismatches
Ensuring frontend components function correctly before releases

Documentation

Show Skills.md file

Web Application Testing

To test local web applications, write native Python Playwright scripts.

Helper Scripts Available:

scripts/with_server.py - Manages server lifecycle (supports multiple servers)

Always run scripts with --help first to see usage. DO NOT read the source until you try running the script first and find that a customized solution is abslutely necessary. These scripts can be very large and thus pollute your context window. They exist to be called directly as black-box scripts rather than ingested into your context window.

Decision Tree: Choosing Your Approach

User task → Is it static HTML?
    ├─ Yes → Read HTML file directly to identify selectors
    │         ├─ Success → Write Playwright script using selectors
    │         └─ Fails/Incomplete → Treat as dynamic (below)
    │
    └─ No (dynamic webapp) → Is the server already running?
        ├─ No → Run: python scripts/with_server.py --help
        │        Then use the helper + write simplified Playwright script
        │
        └─ Yes → Reconnaissance-then-action:
            1. Navigate and wait for networkidle
            2. Take screenshot or inspect DOM
            3. Identify selectors from rendered state
            4. Execute actions with discovered selectors

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