I noticed that if you do not have a working internet connection, the output of JSROOT will not be displayed in the notebooks; the cell will be completely empty. The
<div> that contains the output will show a grayed-out
<script> element when you inspect the output in your browser.
I could reproduce this on all machines (about 7 or so) that I have tried on so far. I assume this is a bug - hopefully, one that could be fixed.
ROOT Version: 6.18/04
Platform: Ubuntu 16.04
Tested Browsers: Chrome, Firefox (latest versions on day of writing)