It's all the code areas in the documentation, like the npm commands here: http://tabulator.info/docs/4.1/quickstart
If that helps, console says it failed to load the following (but gave no reason):
>https://cdn.rawgit.com/google/code-prettify/master/loader/ru...
>https://cdn.rawgit.com/google/code-prettify/master/loader/la...
Maybe it's some cross-site loading being blocked, I dunno.