Tabindex in zoom disabled images
I've been using Rise for a short time, and I find a very useful tool. I appreciate specially the effort done in regards to accesibility and WCAG criteria. The keyboard navigation using tab on the side navigation menu, including search, it's a very good job.
However, there is a small detail (I think it's easy to solve). Images by default can be zoomed in when clicked on or pressing enter when they have focus, and that's ok. But if you disable the zoom, the picture still can receive focus when browsing the page using the tab key.
The HTML attribute 'tabindex' should be removed when an image zoom capability is disabled, to avoid this issue.