This directory contains testsuites for CSS WG specifications, including ones that do not strictly speaking define CSS features, e.g., Geometry Interfaces.
The directories should be named like the specification's shortname, but without any level suffix.
As the test harness relies on the largely undocumented old CSS build system, this directory has a number of test requirements specific to it:
support files for a given test must live in an adjacent support directory;
tests must have a <link rel=help> pointing to what they are testing;
for each spec so linked, test filenames must be unique; and
support and reference files must have unique filenames within the entire css directory.