Flag Environment Matrix Changelog Block for React

Edit GATES at the top of the file: a key and a share from 0 to 100 for each of dev, staging and production. The state word (Off at 0, On at 100, Rolling out between), the headline count and every cell are computed from the numbers.

bucketOf folds the characters of the id into a number and scatters it, which gives the same bucket from 0 to 99 for the same id every time. A user is in a rollout while their bucket is under its share, so widening a rollout only ever adds users. It's a small demonstration hash: use your service's own bucketing in production.

The cells and the counts under the field update at once and nothing is sent anywhere. Screen readers hear the bucket once typing pauses, not on every key. An empty field shows no bucket and every cell says "No user".

Yes: a native table with a caption, scope on every header and the flag key as the row header. Below md the three environments move under each key as a list, so a row keeps its shares without scrolling sideways.

No. Every cell always has the same three lines (the share, the bar and the user's place), and the answer under the field reserves its room, so nothing moves.

The table and the field mirror. Bars, ticks and ids are drawn left to right, because a share is a distance from zero, and numbers keep their reading order.