This is a document covering the completeness of my elm-css fork against most CSS properties and values that currently exist. (This list was compiled by someone else several years ago, so there may be some things missing.)
Source: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference
- Tick: This has been fully implemented.
- 🐲: There are tests fully covering this property.
- (for values this means there is extensive testing for them in property tests)