serious question - now that github natively supports ipython is there any reason to link to nbviewer ?
The GitHub rendering engine for Ipython notebooks does not support mobile devices (oddly) and it does not support custom CSS/plugins, although this notebook does not utilize any of the latter.
good to know - thank you!
The native GitHub IPython Notebook viewer also doesn't support within-notebook linking, which can be fairly annoying when you spend an hour putting together a nice table of contents system.
Automated table of contents really should be built into Jupyter, given how often it is used in practice. Although there is an nbextension [1].