The CSS detects that the screen is small, and collapses the sections.
Normally, a click on the section name should open it, through the javascript "toggleOpenSection" call.
But it is based on jQuery, which is not loaded in the iframe (because no javascript is injected at all for now. See #152).
As a consequence, the section content can not be read at all.

On Firefox OS, the CSP seems to block the inline javascript call too (but this old platform is not a priority).

The best way to solve this would be to enable javascript, by implementing #152. I think it's the first approach we should try.