It’s not intentional that it was ever included in the first place, as it doesn’t meet our bar of spec/support for standard lib inclusion. The removal was documented ahead of time as [USER] pointed out. We’re aware that 4.4 included more lib breaks than usual as we transitioned to a new process for generating them, and while we expect that the breakiness of 4.4 was a one-time pain associated with that transition, we’re having conversations about how we can do better with this in the future. That’s part of the motivation for a versioned `@types/web` ([URL] and potentially other ways of versioning and resolving libs (#45685)—in general, we don’t think it makes sense for people to be stuck dealing with lib changes (particularly DOM lib changes) if they want to upgrade their TS version.