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.
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In short, change compatibility.bs and submit your patch, with a
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Please add your name to the Acknowledgments section in your first pull request, even for trivial fixes. The names are sorted lexicographically.
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Tests can be found in the compat/ directory of
web-platform-tests/wpt.