Compatibility Standard
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Compatibility Standard

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The Compatibility Standard standardizes a number of (often vendor-prefixed) CSS properties and DOM APIs that web browsers need to support for compatibility with the web.

Code of conduct

We are committed to providing a friendly, safe, and welcoming environment for all. Please read and respect the WHATWG Code of Conduct.

Pull requests

In short, change and submit your patch, with a good commit message. Consider reading through the WHATWG FAQ if you are new here.

Please add your name to the Acknowledgments section in your first pull request, even for trivial fixes. The names are sorted lexicographically.

Building "locally"

For quick local iteration, run make. To verify your changes locally, run make deploy. See more in the WHATWG Contributor Guidelines.

Merge policy

If you can commit to this repository, see the WHATWG Maintainer Guidelines.


Tests can be found in the compat/ directory of web-platform-tests/wpt.