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Run npx skillmds add majiayu000/playwright-core in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Playwright Core free to use?

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Who published Playwright Core?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Playwright Core by majiayu000 — Agent Skill

Name: Playwright Core
Rating: 4.2 (5 reviews)
Author: majiayu000

Playwright Core

Battle-tested Playwright patterns for E2E, API, component, visual, accessibility, and security testing. Covers locators, assertions, fixtures, network mocking, auth flows, debugging, and framework recipes for React, Next.js, Vue, and Angular. TypeScript and JavaScript.

majiayu000 02ca50a 2 files · 9.2 KB Updated Sep 9, 2026 567 repo stars

File contents

Playwright Core Testing

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

46 reference guides covering the full Playwright testing surface: selectors, assertions, fixtures, network mocking, auth, visual regression, accessibility, API testing, debugging, and more — with TypeScript and JavaScript examples throughout.

Golden Rules

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

Guide Index

Writing Tests

What you're doing	Guide	Deep dive
Choosing selectors	locators.md	locator-strategy.md
Assertions & waiting	assertions-and-waiting.md
Organizing test suites	test-organization.md	test-architecture.md
Playwright config	configuration.md
Fixtures & hooks	fixtures-and-hooks.md
Test data	test-data-management.md
Auth & login	authentication.md	auth-flows.md
API testing (REST/GraphQL)	api-testing.md
Visual regression	visual-regression.md
Accessibility	accessibility.md
Mobile & responsive	mobile-and-responsive.md
Component testing	component-testing.md
Network mocking	network-mocking.md	when-to-mock.md
Forms & validation	forms-and-validation.md
File uploads/downloads	file-operations.md	file-upload-download.md
Error & edge cases	error-and-edge-cases.md
CRUD flows	crud-testing.md
Drag and drop	drag-and-drop.md
Search & filter UI	search-and-filter.md

Debugging & Fixing

Problem	Guide
General debugging workflow	debugging.md
Specific error message	error-index.md
Flaky / intermittent tests	flaky-tests.md
Common beginner mistakes	common-pitfalls.md

Framework Recipes

Framework	Guide
Next.js (App Router + Pages Router)	nextjs.md
React (CRA, Vite)	react.md
Vue 3 / Nuxt	vue.md
Angular	angular.md

Specialized Topics

Topic	Guide
Multi-user & collaboration	multi-user-and-collaboration.md
WebSockets & real-time	websockets-and-realtime.md
Browser APIs (geo, clipboard, permissions)	browser-apis.md
iframes & Shadow DOM	iframes-and-shadow-dom.md
Canvas & WebGL	canvas-and-webgl.md
Service workers & PWA	service-workers-and-pwa.md
Electron apps	electron-testing.md
Browser extensions	browser-extensions.md
Security testing	security-testing.md
Performance & benchmarks	performance-testing.md
i18n & localization	i18n-and-localization.md
Multi-tab & popups	multi-context-and-popups.md
Clock & time mocking	clock-and-time-mocking.md
Third-party integrations	third-party-integrations.md

Architecture Decisions

Question	Guide
Which locator strategy?	locator-strategy.md
E2E vs component vs API?	test-architecture.md
Mock vs real services?	when-to-mock.md

---name: playwright-coredescription: Battle-tested Playwright patterns for E2E, API, component, visual, accessibility, and security testing. Covers locators, assertions, fixtures, network mocking, auth flows, debugging, and framework recipes for React, Next.js, Vue, and Angular. TypeScript and JavaScript.--- # Playwright Core Testing > Opinionated, production-tested Playwright guidance — every pattern includes when (and when _not_) to use it. **46 reference guides** covering the full Playwright testing surface: selectors, assertions, fixtures, network mocking, auth, visual regression, accessibility, API testing, debugging, and more — with TypeScript and JavaScript examples throughout. ## 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 doing | Guide | Deep dive | | -------------------------- | ------------------------------------------------------ | -------------------------------------------------- | | Choosing selectors | [locators.md](locators.md) | [locator-strategy.md](locator-strategy.md) | | Assertions & waiting | [assertions-and-waiting.md](assertions-and-waiting.md) | | | Organizing test suites | [test-organization.md](test-organization.md) | [test-architecture.md](test-architecture.md) | | Playwright config | [configuration.md](configuration.md) | | | Fixtures & hooks | [fixtures-and-hooks.md](fixtures-and-hooks.md) | | | Test data | [test-data-management.md](test-data-management.md) | | | Auth & login | [authentication.md](authentication.md) | [auth-flows.md](auth-flows.md) | | API testing (REST/GraphQL) | [api-testing.md](api-testing.md) | | | Visual regression | [visual-regression.md](visual-regression.md) | | | Accessibility | [accessibility.md](accessibility.md) | | | Mobile & responsive | [mobile-and-responsive.md](mobile-and-responsive.md) | | | Component testing | [component-testing.md](component-testing.md) | | | Network mocking | [network-mocking.md](network-mocking.md) | [when-to-mock.md](when-to-mock.md) | | Forms & validation | [forms-and-validation.md](forms-and-validation.md) | | | File uploads/downloads | [file-operations.md](file-operations.md) | [file-upload-download.md](file-upload-download.md) | | Error & edge cases | [error-and-edge-cases.md](error-and-edge-cases.md) | | | CRUD flows | [crud-testing.md](crud-testing.md) | | | Drag and drop | [drag-and-drop.md](drag-and-drop.md) | | | Search & filter UI | [search-and-filter.md](search-and-filter.md) | | ### Debugging & Fixing | Problem | Guide | | -------------------------- | ---------------------------------------- | | General debugging workflow | [debugging.md](debugging.md) | | Specific error message | [error-index.md](error-index.md) | | Flaky / intermittent tests | [flaky-tests.md](flaky-tests.md) | | Common beginner mistakes | [common-pitfalls.md](common-pitfalls.md) | ### Framework Recipes | Framework | Guide | | ----------------------------------- | ------------------------ | | Next.js (App Router + Pages Router) | [nextjs.md](nextjs.md) | | React (CRA, Vite) | [react.md](react.md) | | Vue 3 / Nuxt | [vue.md](vue.md) | | Angular | [angular.md](angular.md) | ### Specialized Topics | Topic | Guide | | ------------------------------------------ | ------------------------------------------------------------------ | | Multi-user & collaboration | [multi-user-and-collaboration.md](multi-user-and-collaboration.md) | | WebSockets & real-time | [websockets-and-realtime.md](websockets-and-realtime.md) | | Browser APIs (geo, clipboard, permissions) | [browser-apis.md](browser-apis.md) | | iframes & Shadow DOM | [iframes-and-shadow-dom.md](iframes-and-shadow-dom.md) | | Canvas & WebGL | [canvas-and-webgl.md](canvas-and-webgl.md) | | Service workers & PWA | [service-workers-and-pwa.md](service-workers-and-pwa.md) | | Electron apps | [electron-testing.md](electron-testing.md) | | Browser extensions | [browser-extensions.md](browser-extensions.md) | | Security testing | [security-testing.md](security-testing.md) | | Performance & benchmarks | [performance-testing.md](performance-testing.md) | | i18n & localization | [i18n-and-localization.md](i18n-and-localization.md) | | Multi-tab & popups | [multi-context-and-popups.md](multi-context-and-popups.md) | | Clock & time mocking | [clock-and-time-mocking.md](clock-and-time-mocking.md) | | Third-party integrations | [third-party-integrations.md](third-party-integrations.md) | ### Architecture Decisions | Question | Guide | | ------------------------ | -------------------------------------------- | | Which locator strategy? | [locator-strategy.md](locator-strategy.md) | | E2E vs component vs API? | [test-architecture.md](test-architecture.md) | | Mock vs real services? | [when-to-mock.md](when-to-mock.md) |

Frequently asked questions