This looks great. I love the simplicity on mobile and it has some nice touches (e.g. top progress bar).

I'm working on a project that needs something similar to this - embedded html presentations - but I'm faced with a problem I haven't found an easy solution to yet.

Markdown is great if there is just text or maybe only an image and text, but it falls down pretty hard with oddly shaped images or multiple images.

I'm considering making a js script to reformat things to look reasonable (e.g. Two column text + image with a tall image). Is there anything like this that exists currently?