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
It's pretty easy. That translates to React.createElement(Foo) or whatever and that is just JavaScript 


Sure? The are tons of proprietary languages that compile to JavaScript.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.