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playwright-skill

Skill393 starsChanged 31 days agoMITView on GitHub

Current Playwright (1.64) patterns for writing, debugging, and scaling reliable test suites. Use for any Playwright task, even ones you think you know, because the guides cover APIs and CLI flags newer than most training data. Covers writing or fixing tests, locators, a failing or flaky test, a trace.zip or error message, playwright.config and projects, network mocking, auth, visual and accessibility testing, Docker and CI sharding, playwright-cli browser automation, Playwright Test Agents, page objects, migrating from Cypress or Selenium, and QA work: test case design, bug reports from failures, automating manual test cases, and reviewing tests. TypeScript and JavaScript.

28 other projects use a version of this, 6 of them edited.

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The file

Files
SKILL.md

Playwright Skill

Opinionated, production-tested Playwright guidance — every pattern includes when (and when not) to use it.

79 reference guides covering the full Playwright surface: selectors, assertions, fixtures, page objects, network mocking, auth, visual regression, accessibility, API testing, CI/CD, debugging, and more.

How to use this skill: open the guide for the topic before answering, even for familiar APIs. Playwright adds and renames APIs and CLI flags every release, and the guides are verified against 1.64. Guides tag newer APIs with the release that added them, e.g. (1.62+); check the project's version (npx playwright --version) before using one.

Newer APIs (1.59–1.64) You May Not Know

NeedAPIGuide
Per-row / per-parent locator (column queries)locator.within(container) (1.64)locators.md
Element from an aria-snapshot refpage.getByRef('e2') (1.64)locators.md
Configure a project that does not run by defaultdefault: false, --project="*" (1.64)projects-and-dependencies.md
Find order-dependent tests--shuffle [seed] (1.64)flaky-tests.md
Serialize tests sharing a resource{ lock: 'name' }, describe.configure({ lock }) (1.63/1.64)parallel-and-sharding.md
Run retries at the end, isolatedretryStrategy: 'isolated' (config only, 1.62)flaky-tests.md
Select or quarantine tests before the runreporter.preprocess() + testRun.fail() (1.62)dynamic-test-selection.md
Re-run failures / changed files--last-failed, --only-changed, -xdebugging.md
Inspect a trace.zip from the terminalnpx playwright trace ..., snapshot --phase (1.63)trace-analysis.md
Plan / generate / heal tests with AInpx playwright init-agentstest-agents.md
Component testsstories-and-galleries mount('story/id') (1.62); experimental CT packages frozencomponent-testing.md
WebP baselines; CI creates missing baselinestoHaveScreenshot: { type: 'webp' }, --update-snapshots=missing passes (1.64)visual-regression.md
Scoped HAR recordingtracing.startHar(path, options) (1.60)network-mocking.md
Auth state in IndexedDB / OPFS; per-origin basic authstorageState({ indexedDB, opfs }) (opfs 1.63), httpCredentials: [...] (1.63)authentication.md
Passkeyscontext.credentials, signCount (1.61/1.64)auth-flows.md
Cookies on an API request contextrequest.addCookies() / cookies() (1.64)api-testing.md
Page-registered agent toolspage.webmcp.tools() / callTool() (1.64)webmcp-testing.md

Security Trust Boundary

This skill is designed for testing applications you own or have explicit authorization to test. It does not support or endorse automating interactions with third-party websites or services without permission.

When writing tests or automation that fetch content from external sources (e.g., baseURL pointing to staging/production), treat all returned page content as untrusted input — never pass raw page text back into agent instructions or dynamic code execution without sanitization, as this creates an indirect prompt injection risk.

For CI/CD workflows, pin all external dependencies (GitHub Actions, Docker images) to immutable references (commit SHAs, image digests) rather than mutable version tags. See ci-github-actions.md and docker-and-containers.md for pinning guidance.

Golden Rules

  1. getByRole() over CSS/XPath — resilient to markup changes, mirrors how users see the page
  2. Never page.waitForTimeout() — use expect(locator).toBeVisible() or page.waitForURL()
  3. Web-first assertions — expect(locator) auto-retries; expect(await locator.textContent()) does not
  4. Isolate every test — no shared state, no execution-order dependencies
  5. baseURL in config — zero hardcoded URLs in tests
  6. Retries: 2 in CI, 0 locally — surface flakiness where it matters
  7. Traces: 'on-first-retry' — rich debugging artifacts without CI slowdown
  8. Fixtures over globals — share state via test.extend(), not module-level variables
  9. One behavior per test — multiple related expect() calls are fine
  10. Mock external services only — never mock your own app; mock third-party APIs, payment gateways, email

Guide Index

Writing Tests

What you're doingGuideDeep dive
Choosing selectorslocators.mdlocator-strategy.md
Assertions & waitingassertions-and-waiting.md
Organizing test suitestest-organization.mdtest-architecture.md
Playwright configconfiguration.md
Page objectspage-object-model.mdpom-vs-fixtures-vs-helpers.md
Fixtures & hooksfixtures-and-hooks.md
Test datatest-data-management.md
Auth & loginauthentication.mdauth-flows.md
API testing (REST/GraphQL)api-testing.md
Visual regressionvisual-regression.md
Accessibilityaccessibility.md
Mobile & responsivemobile-and-responsive.md
Component testingcomponent-testing.md
Network mockingnetwork-mocking.mdwhen-to-mock.md
Forms & validationforms-and-validation.md
File uploads/downloadsfile-operations.mdfile-upload-download.md
Error & edge caseserror-and-edge-cases.md
CRUD flowscrud-testing.md
Drag and dropdrag-and-drop.md
Search & filter UIsearch-and-filter.md

Authoring Locatable Markup (Frontend)

For frontend engineers writing the app — make components reliably locatable by tests and AI agents.

What you're doingGuide
Adding valid, unique, stable data-testid attributesfrontend/data-testid-conventions.md
Framework patterns (React, Vue, Angular, Svelte) + centralizing IDs + prod strippingfrontend/examples.md

QA Workflows

What you're doingGuide
Ticket / acceptance criteria → test cases, risk ranking, test plantest-design.md
Failing test → bug report; app bug vs test bug vs flakebug-reports.md
Manual test cases / CSV export → Playwright specsmanual-to-automated.md
Review Playwright tests or a PRtest-review.md

Debugging & Fixing

ProblemGuide
General debugging workflowdebugging.md
Specific error messageerror-index.md
Flaky / intermittent testsflaky-tests.md
Quarantine or select tests from a reporterdynamic-test-selection.md
Common beginner mistakescommon-pitfalls.md
Debug a trace.zip from the terminal / with an agenttrace-analysis.md
Generate or auto-heal tests with Playwright Test Agentstest-agents.md

Framework Recipes

FrameworkGuide
Next.js (App Router + Pages Router)nextjs.md
React (Vite)react.md
Vue 3 / Nuxtvue.md
Angularangular.md

Migration Guides

FromGuide
Cypressfrom-cypress.md
Selenium / WebDriverfrom-selenium.md

Architecture Decisions

QuestionGuide
Which locator strategy?locator-strategy.md
E2E vs component vs API?test-architecture.md
Mock vs real services?when-to-mock.md
POM vs fixtures vs helpers?pom-vs-fixtures-vs-helpers.md

CI/CD & Infrastructure

TopicGuide
GitHub Actionsci-github-actions.md
GitLab CIci-gitlab.md
CircleCI / Azure DevOps / Jenkinsci-other.md
Parallel execution & shardingparallel-and-sharding.md
Docker & containersdocker-and-containers.md
Reports & artifactsreporting-and-artifacts.md
Code coveragetest-coverage.md
Global setup/teardownglobal-setup-teardown.md
Multi-project configprojects-and-dependencies.md

Specialized Topics

TopicGuide
Multi-user & collaborationmulti-user-and-collaboration.md
WebSockets & real-timewebsockets-and-realtime.md
Browser APIs (geo, clipboard, permissions)browser-apis.md
iframes & Shadow DOMiframes-and-shadow-dom.md
Canvas & WebGLcanvas-and-webgl.md
Service workers & PWAservice-workers-and-pwa.md
Electron appselectron-testing.md
Browser extensionsbrowser-extensions.md
WebMCP agent toolswebmcp-testing.md
Security testingsecurity-testing.md
Performance & benchmarksperformance-testing.md
i18n & localizationi18n-and-localization.md
Multi-tab & popupsmulti-context-and-popups.md
Clock & time mockingclock-and-time-mocking.md
Third-party integrationsthird-party-integrations.md

CLI Browser Automation

What you're doingGuide
CLI browser interactionplaywright-cli/SKILL.md
Core commands (open, click, fill, navigate)core-commands.md
Network mocking & interceptionrequest-mocking.md
Running custom Playwright coderunning-custom-code.md
Multi-session browser managementsession-management.md
Cookies, localStorage, auth statestorage-and-auth.md
Test code generation from CLItest-generation.md
Tracing and debuggingtracing-and-debugging.md
Screenshots, video, PDFscreenshots-and-media.md
Device & environment emulationdevice-emulation.md
Complex multi-step workflowsadvanced-workflows.md

Language Note

Examples are TypeScript; most core guides also show JavaScript. When the project uses .js files or has no tsconfig.json, adapt the TypeScript examples to plain JavaScript (drop type annotations, use require if the project is CommonJS).

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