| Introduction | |
| ------------ | |
| This directory contains testsuites for CSS WG specifications, including ones | |
| that do not strictly speaking define CSS features, e.g., | |
| [Geometry Interfaces](https://drafts.csswg.org/geometry/). | |
| 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>`][spec-link] 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. | |
| [spec-link]: https://web-platform-tests.org/writing-tests/css-metadata.html#specification-links |