[WorldMaker]

Right, browsers own it instead of websites needing to rebuild Moment.js bundles. Additionally, most browsers pass the ownership further to the user's OS as the IANA timezone database is a useful system-level service and best updated at the cadence of OS "required" updates.

[nekevss]

I believe V8 / chrome bundles IANA time zones into the zoneinfo64 resource bundle. I'm not actually sure they hit the system tzdb at all.