playwright-best-practices
Use when writing Playwright tests, fixing flaky tests, debugging failures, implementing Page Object Model, configuring CI/CD, optimizing performance, mocking APIs, handling authentication or OAuth, testing accessibility (axe-core), file uploads/downloads, date/time mocking, WebSockets, geolocation, permissions, multi-tab/popup flows, mobile/responsive layouts, touch gestures, GraphQL, error handling, offline mode, multi-user collaboration, third-party services (payments, email verification), console error monitoring, global setup/teardown, test annotations (skip, fixme, slow), test tags (@smoke, @fast, @critical, filtering with --grep), project dependencies, security testing (XSS, CSRF, auth), performance budgets (Web Vitals, Lighthouse), iframes, component testing, canvas/WebGL, service workers/PWA, test coverage, i18n/localization, Electron apps, or browser extension testing. Covers E2E, component, API, visual, accessibility, security, Electron, and extension testing.
What this skill does
# Playwright Best Practices This skill provides comprehensive guidance for all aspects of Playwright test development, from writing new tests to debugging and maintaining existing test suites. ## Activity-Based Reference Guide Consult these references based on what you're doing: ### Writing New Tests **When to use**: Creating new test files, writing test cases, implementing test scenarios | Activity | Reference Files | | ----------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- | | **Writing E2E tests** | [test-suite-structure.md](core/test-suite-structure.md), [locators.md](core/locators.md), [assertions-waiting.md](core/assertions-waiting.md) | | **Writing component tests** | [component-testing.md](testing-patterns/component-testing.md), [test-suite-structure.md](core/test-suite-structure.md) | | **Writing API tests** | [api-testing.md](testing-patterns/api-testing.md), [test-suite-structure.md](core/test-suite-structure.md) | | **Writing GraphQL tests** | [graphql-testing.md](testing-patterns/graphql-testing.md), [api-testing.md](testing-patterns/api-testing.md) | | **Writing visual regression tests** | [visual-regression.md](testing-patterns/visual-regression.md), [canvas-webgl.md](testing-patterns/canvas-webgl.md) | | **Structuring test code with POM** | [page-object-model.md](core/page-object-model.md), [test-suite-structure.md](core/test-suite-structure.md) | | **Setting up test data/fixtures** | [fixtures-hooks.md](core/fixtures-hooks.md), [test-data.md](core/test-data.md) | | **Handling authentication** | [authentication.md](advanced/authentication.md), [authentication-flows.md](advanced/authentication-flows.md) | | **Testing date/time features** | [clock-mocking.md](advanced/clock-mocking.md) | | **Testing file upload/download** | [file-operations.md](testing-patterns/file-operations.md), [file-upload-download.md](testing-patterns/file-upload-download.md) | | **Testing forms/validation** | [forms-validation.md](testing-patterns/forms-validation.md) | | **Testing drag and drop** | [drag-drop.md](testing-patterns/drag-drop.md) | | **Testing accessibility** | [accessibility.md](testing-patterns/accessibility.md) | | **Testing security (XSS, CSRF)** | [security-testing.md](testing-patterns/security-testing.md) | | **Using test annotations** | [annotations.md](core/annotations.md) | | **Using test tags** | [test-tags.md](core/test-tags.md) | | **Testing iframes** | [iframes.md](browser-apis/iframes.md) | | **Testing canvas/WebGL** | [canvas-webgl.md](testing-patterns/canvas-webgl.md) | | **Internationalization (i18n)** | [i18n.md](testing-patterns/i18n.md) | | **Testing Electron apps** | [electron.md](testing-patterns/electron.md) | | **Testing browser extensions** | [browser-extensions.md](testing-patterns/browser-extensions.md) | ### Mobile & Responsive Testing **When to use**: Testing mobile devices, touch interactions, responsive layouts | Activity | Reference Files | | ------------------------------- | -------------------------------------------------------------------------------- | | **Device emulation** | [mobile-testing.md](advanced/mobile-testing.md) | | **Touch gestures (swipe, tap)** | [mobile-testing.md](advanced/mobile-testing.md) | | **Viewport/breakpoint testing** | [mobile-testing.md](advanced/mobile-testing.md) | | **Mobile-specific UI** | [mobile-testing.md](advanced/mobile-testing.md), [locators.md](core/locators.md) | ### Real-Time & Browser APIs **When to use**: Testing WebSockets, geolocation, permissions, multi-tab flows | Activity | Reference Files | | ------------------------------- | ---------------------------------------------------------------------------------------- | | **WebSocket/real-time testing** | [websockets.md](browser-apis/websockets.md) | | **Geolocation mocking** | [browser-apis.md](browser-apis/browser-apis.md) | | **Permission handling** | [browser-apis.md](browser-apis/browser-apis.md) | | **Clipboard testing** | [browser-apis.md](browser-apis/browser-apis.md) | | **Camera/microphone mocking** | [browser-apis.md](browser-apis/browser-apis.md) | | **Multi-tab/popup flows** | [multi-context.md](advanced/multi-context.md) | | **OAuth popup handling** | [third-party.md](advanced/third-party.md), [multi-context.md](advanced/multi-context.md) | ### Debugging & Troubleshooting **When to use**: Test failures, element not found, timeouts, unexpected behavior | Activity | Reference Files | | ------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- | | **Debugging test failures** | [debugging.md](debugging/debugging.md), [assertions-waiting.md](core/assertions-waiting.md) | | **Fixing flaky tests** | [flaky-tests.md](debugging/flaky-tests.md), [debugging.md](debugging/debugging.md), [assertions-waiting.md](core/assertions-waiting.md) | | **Debugging flaky parallel runs** | [flaky-tests.md](debugging/flaky-tests.md), [performance.md](infrastructure-ci-cd/performance.md), [fixtures-hooks.md](core/fixtures-hooks.md) | | **Ensuring test isolation / avoiding state leak** | [flaky-tests.md](debugging/flaky-tests.md), [fixtures-hooks.md](core/fixtures-hooks.md), [performance.md](infrastructure-
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