Basic editor as described in documentation not working

Following the instructions here:

I get the below result:

I am on Ubuntu 16.10 using npm 4.0.5. I don’t see any errors anywhere, just a few warnings about missing description etc during npm install.

What, exactly, is not working about the editor?

Sorry for the lack of clarity. For instance undo does not work, which I assume it is suppose to?

If you’re running the version from the bottom of the page, which has the undo plugin enabled, then yes, it is supposed to. So which code are you running, and what exactly are you doing to test?

I was trying the first example, but apparently did not understand how barebones that is, sorry about that.