Frontend Testing & Debugging

What it does

This Codex skill combines a targeted frontend fix with evidence from the rendered application. It defines the user flow first, chooses the browser tooling available in the plugin environment and repeats the same interaction after editing. Its distinguishing feature is the validation contract: page identity, nonblank content, framework errors, console health, screenshot evidence and an actual interaction must all be considered.

When to use it

• Repair a mobile navigation layer that obscures the search box.
• Diagnose a dashboard control that changes visually but does not update the application state.
• Verify a small responsive UI change and report precisely which flow and viewports were tested.

Step-by-step workflow

1. Identify the route, action and expected visible result. For a smoke test, name the first meaningful screen and primary control.
2. Check whether the Browser plugin is available. The source prioritizes that path; it documents when regular Playwright is appropriate and requires reporting fallback reasons.
3. Inspect the page and reproduce the problem before editing. Verify the exact host and page identity to avoid testing the wrong app.
4. Make the smallest useful change, reload and repeat the target interaction. Collect visible state evidence after the action.
5. Report the environment, verified behavior, console findings, screenshots and remaining gaps. A passing build is only one part of validation.

Example request

Use frontend-testing-debugging on our existing dashboard. At mobile width, opening the navigation covers the search field and leaves focus behind the menu. Reproduce the issue, make a focused fix and verify open, close, Escape and keyboard focus behavior. Repeat at desktop width. Report page identity, relevant console errors, screenshots and the exact interaction result. Preserve existing dependencies.

Worked example

For a menu fix, observing that the panel appears is insufficient. The useful loop opens it, confirms expected content, checks focus, closes it and verifies the search field is usable again. A screenshot supports the overlap claim; an interaction confirms the control works. Keep the same route and application state before and after the patch.

What you get

A targeted fix and a QA report backed by an exercised interaction and rendered evidence.

How to evaluate the result

• Expect a focused patch and a QA report with a named flow, viewport details and observed outcomes.
• Verify relevant console errors are addressed or explained. Distinguish preexisting unrelated warnings from failures introduced by the change.
• Check at least one real state transition. Build output or an empty screenshot cannot establish functional success.

What you need

The Build Web Apps plugin context and its supported browser tooling; fallback requirements are described in the source.

Setup and activation

This skill is part of the build-web-apps plugin in openai/plugins. Use the plugin workflow supported by your Codex client, then request the skill by name. Preserve companion references and required tool integrations. The repository describes plugin manifests and marketplace metadata; it does not establish one universal installation command for every Codex environment. This page installs nothing. Before local installation, review and security-scan the exact source/version; catalogue inclusion is not security approval.

Limits and considerations

This workflow depends on the Build Web Apps plugin context and available browser tools. Copying the text alone may omit those capabilities. It is not a substitute for comprehensive end-to-end coverage, every device or production data validation.

Related workflows

• Use Frontend Design for the visual concept before verification.
• Use React Best Practices for performance-sensitive React changes.

License and reuse

Check the plugin and repository license terms.

Further reading

• Publisher setup and repository README