chromium/third_party/blink/web_tests/fast/forms/color-scheme/README.md

This directory holds tests that need to be validated across different color schemes (ex. forced colors mode).

If you are adding a test to this directory, make sure your test actually needs to be validated across multiple color schemes, and that there isn't already a color scheme validation test that covers your scenario. If your test does not need color scheme validation, add it outside of this directory.