[jridgewell]

rawgit.com is sunsetted[1], so this URL may die any day now. It's simply a proxy server for content hosted on GitHub. In this case, the real source is https://gist.github.com/darcyparker/1886716, and it's displayable (officially) at [2].

[1]: https://rawgit.com/ [2]: https://gist.githubusercontent.com/darcyparker/1886716/raw/c...