This directory contains the CSS build system.

It is recommended that it is run with build.sh, as this ensures all dependencies are installed. Note that it is not required to build the testsuites to run tests; you can just run tests as with any other web-platform-tests tests (see ../../docs/).

The build system is formed of build.py in this directory, the w3ctestlib package in w3ctestlib/, and the apiclient package in apiclient/apiclient/. Note that apiclient exists as a separate upstream project at https://hg.csswg.org/dev/apiclient/, and that ideally any changes here should make it upstream.

Warning: The CSS build system is not tested in CI at all, so don't make any changes without ensuring that it still works locally.