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emlun/wpt

Analysis updated 2026-07-18 · repo last pushed 2025-11-26

Audience · developerComplexity · 3/5QuietSetup · moderate

TLDR

Web Platform Tests is a massive shared test suite that browser makers run to verify their browser follows the same web standards as Chrome, Firefox, Safari, and Edge.

Mindmap

mindmap
  root((repo))
    What it does
      Cross-browser tests
      Checks web standards
      Tracks compatibility
    Tech stack
      HTML CSS JavaScript
      wpt live runner
      wpt fyi dashboard
    Use cases
      Catch browser bugs
      Verify spec compliance
      Track pass rates
    Audience
      Browser vendors
      Standards bodies
      Web developers

Code map

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What do people build with it?

USE CASE 1

Run the test suite in your browser at wpt.live to check standards compliance.

USE CASE 2

Check wpt.fyi to see how a browser's pass rate compares to competitors over time.

USE CASE 3

Write and submit a new test for a web feature you care about.

USE CASE 4

Trace a cross-browser bug back to a specific failing test to know if it's a bug or a spec gap.

What is it built with?

HTMLCSSJavaScript

How does it compare?

emlun/wpt0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2025-11-262022-10-032020-05-03
MaintenanceQuietDormantDormant
Setup difficultymoderateeasyeasy
Complexity3/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 1h+

Running the full suite locally requires cloning a very large repository and setting up test infrastructure.

No license information is mentioned in the explanation.

Copy-paste prompts

Prompt 1
Walk me through forking this repo and writing a new test for a CSS feature I care about.
Prompt 2
Show me how to use the linter and manifest generator tools in this repo before submitting a test.
Prompt 3
Explain how to run a subset of these tests locally in my browser to check a specific web API.
Prompt 4
Help me find whether a compatibility bug I found is a known issue by searching this test suite.

Frequently asked questions

What is wpt?

Web Platform Tests is a massive shared test suite that browser makers run to verify their browser follows the same web standards as Chrome, Firefox, Safari, and Edge.

Is wpt actively maintained?

Quiet — no commits in 6-12 months (last push 2025-11-26).

What license does wpt use?

No license information is mentioned in the explanation.

How hard is wpt to set up?

Setup difficulty is rated moderate, with roughly 1h+ to a first successful run.

Who is wpt for?

Mainly developer.

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