Browser Verification

Browser Verification

Trust the browser, not static guesses. Use real rendering for frontend claims.

Setup

Prefer the repo's existing Playwright setup. If none exists, install browser tooling in a local tool directory or temporary environment rather than adding a production dependency.

Use a local static or dev server when file URLs would not match production behavior.

For security review of live targets, request routing through authorized-security-router first so scope, allowed actions, and non-destructive boundaries are explicit.

Verification Loop

1. Start the app or static server.
2. Open the target URL in a browser-controlled session.
3. Check console errors and failed network requests.
4. Verify key selectors render and have nonzero bounding boxes.
5. Verify images/assets are complete and natural dimensions are nonzero.
6. Check desktop and mobile viewports.
7. Check horizontal overflow: document.documentElement.scrollWidth <= innerWidth + 1.
8. Exercise the primary interaction path.
9. Capture screenshots only when useful for review or debugging.
10. Stop local servers before finalizing.

Common Assertions

• page loaded with expected title or heading;
• no failed requests for CSS, JS, images, fonts, or data;
• no severe console errors;
• target controls are visible and enabled;
• form submission or navigation reaches expected state;
• responsive layout has no text overlap or horizontal scroll;
• animated/canvas/3D surfaces have nonblank rendered pixels when relevant.

Guardrails

• Do not commit local Playwright tooling unless the repo already owns browser tests.
• Do not claim visual verification if only static checks ran.
• If browser install fails, report the fallback checks honestly.
• For authenticated or paid flows, avoid real side effects unless explicitly approved.

Final Report

Include URLs, viewports, checks run, commands, failures found, and whether screenshots were captured.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: markoblogo
• Source: markoblogo/abvx-agent-skills
• License: MIT
• Homepage: https://abvx.xyz/work/abvx-agent-skills

Install and usage instructions live in the source repository linked above.