This is very different from where we’re at today, where there’s one format: HTML
The part of the proposal it comments listed "pure ASCII", and surely we have plaintext files on the web as well. And all kinds of images, sound, video files, which are readily supported by common web browsers, out of the box. PDFs, too, which may contain hyperlinks that are active and handled by common web browsers. And even more if you count those handled by external programs (e.g., LibreOffice Writer must qualify as a "word processor", which is also mentioned in the commented part of the proposal, and then there are all sorts of other markup languages and formats, including those capable of hyperlinking further), web browser extensions, or don't restrict it to common web browsers.
Comments
The part of the proposal it comments listed "pure ASCII", and surely we have plaintext files on the web as well. And all kinds of images, sound, video files, which are readily supported by common web browsers, out of the box. PDFs, too, which may contain hyperlinks that are active and handled by common web browsers. And even more if you count those handled by external programs (e.g., LibreOffice Writer must qualify as a "word processor", which is also mentioned in the commented part of the proposal, and then there are all sorts of other markup languages and formats, including those capable of hyperlinking further), web browser extensions, or don't restrict it to common web browsers.