TIL: Baseline, the web compability database →

Baseline gives you clear information about which web platform features are ready to use in your projects today. When reading an article, or choosing a library for your project, if the features used are all part of Baseline, you can trust the level of browser compatibility.

Baseline has two stages:

Newly available: The feature is supported by all of the core browsers, and is therefore interoperable.

Widely available: 30 months have passed since the newly interoperable date. The feature can be used by most sites without worrying about support.

Prior to being Newly available, a feature has Limited availability when it's not yet supported across browsers.

Baseline status is built into Chrome Dev Tools as well. Hovering over a CSS selector shows this popup: