[ageofwant]

Developers can build whatever they want with the html/css/javascript stack we have today, and they have.

Its up to you whether or not you write semantically pure html using display agnostic <div>, <article> etc. structural elements and only use css for styling. That is, after all, what they are for.

You can have what you want by simply pretending that browsers do not have default rendering rules, and not use the html elements that are arguably presentation only things, like <h1>, <table> etc.