Wikipedia is a textbook case for ideas which led to creation of HTML. If Wikipedia wouldn't be able to be expressed - mainly - in HTML, that would mean HTML is

Wikipedia is a textbook case for ideas which led to creation of HTML. If Wikipedia wouldn't be able to be expressed - mainly - in HTML, that would mean HTML is a theoretical idea, not applicable in reality. In addition to (near) absence of JavaScript, the HTML should be readable by itself - all those nesting levels, lists... Accessibility would benefit, and also using Wikipedia as a structured database - which should definitely be possible. More in line with original Web ideas, interactive content - surely carefully tagged - should have standard solutions for embedded sound, video, 3D scenes, vector, raster and photorealistic graphics, various expressivities of embedded languages (code demonstrations).