Baseline
A shared label for how safe a web feature is to use: Newly available once every core browser supports it, Widely available 30 months later.
Before Baseline, every team answered the same question on its own, usually by reading a support table and guessing. Baseline turns that into one status that MDN, caniuse, and the browser vendors all publish the same way.
The useful part is the 30-month wait. Newly available means the feature works in current browsers; Widely available means the people who update slowly have caught up. Which of the two you require is a decision about your audience, and it can be enforced in CI rather than left to a review.