[wingspan]

Nice! I put together a single file offline HTML version [1] with a demo [2] using only a CDN-hosted QR library.

[1] https://gist.github.com/ianobermiller/9f17f1022bc75c2228d742... [2] https://bl.ocks.org/ianobermiller/raw/9f17f1022bc75c2228d742...