If a goal of the project is to restrict the network to "book- or paper-like documents", then Markdown is woefully inadequate to represent the richness of the ki

If a goal of the project is to restrict the network to "book- or paper-like documents", then Markdown is woefully inadequate to represent the richness of the kinds of real-life paper layouts that people have been making over the ages. I say this after spending years creating ebooks for Standard Ebooks and trying to create HTML-based epubs that emulate the print layout of real print books. I would go so far as to say that until very recently, until the dawn of CSS Flexbox and Grid, it was still impossible to emulate even a medium-complexity paper page layout in HTML/CSS, and HTML/CSS is far richer than Markdown. (For example, vertically and horizontally centering a short dedication in a viewport - basically requires Flexbox but done even better with Grid.) HTML/CSS is very, very well suited to paper-like documents. In fact I'd say the document-based roots of HTML (<section>, <p>, <blockquote>, <i>...) combined with the richness of modern CSS makes HTML/CSS one of the best combos we've ever had for emulating paper. What the author probably really wants is just the regular web but without Javascript or multimedia tags like <video> or <canvas>. (But what about <img>? Books have been illustrated for centuries...)