Spoiler: it isn't. It isn't JavaScript either. Time to call non-standards-track systems what they are.https://twitter.com/_joshburgess/status/994381330770251778 …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.