Guide · Agent skill
How to use the Cross-Browser Testing Checklist agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The cross-browser-testing skill gives an AI agent a checklist for confirming that a website works the same in Chrome, Firefox, Safari and Edge, on desktop and mobile. It is aimed at front-end developers, teams reviewing CI pipelines, and anyone who wants to learn what a basic cross-browser testing standard looks like. After this guide you will know what the skill does, how to install it, how to ask for it in plain language, and what it can and cannot tell you.
Cross-Browser Testing Checklistthedaviddias/Front-End-Checklist · MIT Download the skill Quick start
- 1Download the skill. Download the cross-browser-testing ZIP file from this page and unzip it.
- 2Place the folder. Move the unzipped folder into ~/.claude/skills/ for personal use, or into a project's .claude/skills/ folder.
- 3Or upload it in the apps. In the Claude apps, open Settings, go to Capabilities, then Skills, and upload the skill.
- 4Ask a natural question. Describe what you want reviewed, such as CI browser coverage or whether failures block merges.
- 5Check the findings. Read the gaps the agent lists and confirm them against your CI configuration before changing anything.
What does the cross-browser-testing skill make the agent do?
Users reach your site through different browsers, and each one uses its own rendering engine. Without cross-browser testing, some users may see broken layouts, missing features or complete failures.
When you ask the agent to review a project, it checks whether browser tests are actually automated and enforced in CI (the automated pipeline that runs on each code change), rather than just written down. It can also suggest fixes for browser-specific problems and explain why the testing matters.
- Check that the site is verified in Chrome, Firefox, Safari and Edge at minimum
- Check whether those tests run automatically and whether failures block a change
- Flag exact gaps where the rule is not automatically verified or where failures do not block regressions
- Check CSS features against caniuse.com before they are used
- Suggest fixes for browser-specific issues and document unsupported features gracefully
How do you install the cross-browser-testing skill?
Download the ZIP file for the skill from this page and unzip it. The skill folder contains SKILL.md and references/rule.md.
For a personal install, put the unzipped skill folder inside ~/.claude/skills/. For a single project, put it inside that project's .claude/skills/ folder.
If you use the Claude apps instead, open Settings, go to Capabilities, then Skills, and upload the skill there.
- Personal: ~/.claude/skills/
- Single project: .claude/skills/ inside the project
- Claude apps: Settings → Capabilities → Skills
How do you trigger the skill with natural requests?
You do not need a special command. The skill description says to use it when reviewing CI coverage, automated checks or test strategy for testing across all major browsers, so ask for that in ordinary words. Name the project or the pipeline file so the agent knows where to look.
The skill's focus is whether the rule is continuously verified, not just documented. Phrase requests with that in mind.
- Review our CI workflow and tell me whether browser tests block a merge when they fail.
- Does this project test in Chrome, Firefox, Safari and Edge, or only one browser?
- Audit our test pipeline for gaps in cross-browser coverage on mobile.
- Explain why testing across browsers matters for this checkout page.
What does a passing setup look like?
The reference file shows a Playwright configuration with separate projects for desktop Chrome, Firefox, Safari (WebKit) and Edge, plus mobile browser projects. It also sets retries and worker counts that depend on whether the code is running in CI. When reviewing, the agent compares your config and workflow against this kind of pattern.
The Quick Reference also names Playwright or BrowserStack as automated tools for CI testing. The skill does not write the full test suite for you.
- Test on both desktop and mobile versions of browsers
- Run browser projects inside the CI pipeline, not only on a developer machine
projects: [
{ name: 'chromium', use: { ...devices['Desktop Chrome'] } },
{ name: 'firefox', use: { ...devices['Desktop Firefox'] } },
{ name: 'webkit', use: { ...devices['Desktop Safari'] } },
{ name: 'edge', use: { ...devices['Desktop Edge'], channel: 'msedge' } },
]What does the skill need, and is it safe to run?
The skill lists no requirements. It does not run scripts and does not use the network. It consists of instructions and a reference document, so it is a review guide rather than a tool that changes your code or calls services.
The skill gives guidance, not a guarantee. Real device testing is still needed to confirm compatibility.
- Requires: nothing listed
- Runs scripts: no
- Uses network: no
- Licence: MIT
What are good tips for getting useful results?
Give the agent access to your CI configuration and test folder so it can check enforcement, not just the existence of tests. Ask it to explain each gap it finds, since the skill is designed to explain why the rule matters.
For full implementation details and framework-specific guidance, the agent can read references/rule.md.
- Ask whether failures block regressions, not only whether tests exist
- Ask for fixes one browser at a time when a layout breaks in only one engine
- Check CSS features on caniuse.com before relying on them
What people use it for
- Reviewing a CI workflow to see whether browser tests run on every code change
- Checking whether a project tests mobile browsers as well as desktop ones
- Auditing a team's test pipeline for gaps in Chrome, Firefox, Safari and Edge coverage
- Learning what a basic cross-browser testing standard looks like before setting one up
Frequently asked questions
How do I install the cross-browser testing agent skill?
Download the ZIP from this page and unzip it. Put the folder in ~/.claude/skills/ for personal use or in a project's .claude/skills/ folder, or upload it in the Claude apps under Settings, Capabilities, Skills.
Is the cross-browser testing skill free?
The skill is released under the MIT licence, as listed on this page. Check the repository licence file for the full terms.
What does the skill require?
The skill lists no requirements. It does not run scripts and does not use the network.
Does the skill write my end-to-end tests?
No. It is a review checklist that points to references/rule.md for details. It is not a complete test suite generator.
Can the agent guarantee my site works in every browser?
No. The skill gives guidance, not a guarantee, and real device testing is still needed.
How does this compare with BrowserStack or Playwright?
Playwright and BrowserStack are testing tools that run browser tests, and the skill names them as options for CI testing. The skill reviews whether your browser testing is set up and enforced; it does not replace those tools.
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Our verdict
This skill suits front-end developers and teams who want an agent to check whether browser tests across Chrome, Firefox, Safari and Edge are automated and enforced in CI. It is not the right choice if you need a complete end-to-end test suite written for you or if you need certainty about compatibility without real device testing.
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