web-platform-tests/wpt resource

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

6123 stars · 3915 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A large cross-browser test suite for the Web platform stack, covering specifications from WHATWG, W3C, and other standards bodies. It includes a Python-based test runner and infrastructure so tests can be run locally or in CI against all major browser engines.

Use cases

• verify my browser implementation matches web standards
• run conformance tests for html and dom apis across browsers
• check cross-browser compatibility of web platform features
• write tests for a new web api specification
• compare browser test results on wpt.fyi
• test how firefox chrome and safari handle a css feature

When to choose

• you are a browser vendor or engine developer validating spec compliance
• you need canonical cross-browser tests for a web platform feature
• you contribute to or implement WHATWG/W3C specifications

When to avoid

• you need unit or end-to-end tests for your own web application
• you want a lightweight testing framework like Jest or Playwright for app code

Facets

dataset · maturity active

testing e2e-testing http-server cli web-development testing browser-extensions web-design windows browser python cross-platform web-platform browser-compatibility test-suite w3c whatwg test-runner conformance-testing cross-browser linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="web-platform-tests/wpt")