I'm newbie in Webcomponents, so maybe I'm wrong. As the Webcomponent library is broken, I tried to load it locally so :

• I downloaded repositories : here, here and there.
• I executed the command lines explained in README

  npm install -g bower
  bower install
  bower install -S nuxeo/nuxeo-ui-elements
  npm install -g polymer-cli
  

I had an error: analysis.json missing.

So I did :

polymer analyze > analysis.json && polymer serve

Now, it works. Does “npm doc” is missing in the README.