Thanks for taking your time to report this issue and help making Ubuntu better.
I can confirm this issue, I get a blank window when attempting to open the documentation for nted on Ubuntu 16.04. Oddly enough it seems to work on 17.04 and later, but I am not sure why.
(It shouldn't be affected by the website being down. Most packages include and display the documentation locally)
Thanks for taking your time to report this issue and help making Ubuntu better.
I can confirm this issue, I get a blank window when attempting to open the documentation for nted on Ubuntu 16.04. Oddly enough it seems to work on 17.04 and later, but I am not sure why.
(It shouldn't be affected by the website being down. Most packages include and display the documentation locally)