I share with the author of the article the need for a standard format for presentation-independent structured multimedia content, and that html+js+css is now to

I share with the author of the article the need for a standard format for presentation-independent structured multimedia content, and that html+js+css is now too complex for this purpose. But I think that such a format should keep rich text separate from structure, in the same way that CSS keeps style separate from content. Content structure in a web environment is inherently complex, so there should be a standardized way to link markdown-style simple "pages" that have linear or shallow tree structures, to build the superstructure of a complete web site. In my opinion that lack of a specific format for structure is what is limiting the growth of common tools for rich content. Wikis are the only example I know of an attempt to create such a format, but it works by having basically no structure, just uniquely named pages and hyperlinks between them.