This beta release has been deprecated.  The most recent beta release
can be found at 

https://igv.org/web/release/2.0.0-beta1/

To use this beta release include

https://igv.org/web/release/2.0.0-beta1/dist/igv-all.css
https://igv.org/web/release/2.0.0-beta1/dist/igv.min.js

See examples in https://igv.org/web/release/2.0.0-beta1/examples