Baseline’s evolution on MDN | MDN Blog
These updated definitions makes sense to me:
- Newly available. The feature is marked as interoperable from the day the last core browser implements it. It marks the moment when developers can start getting excited and learning about a feature.
- Widely available. The feature is marked as having wider support thirty months or 2.5 years later. It marks the moment when it’s safe to start using a feature without explicit cross-browser compatibility knowledge.