Mauro Solcia

Using core-list instead of a templare repeat should fix the problem

There are is no sub menu element, but using an iron collapse with the sub items should do the trick

local-storage quota limits seems to be from [2MB to 10MB](http://www.html5rocks.com/en/tutorials/offline/quota-research/) that should suffice for a high number of articles if no images are cached. Evaluate the option of using webservice...

Use Service Workers for a really good offline experience