I would care more about markup if the browser would actually be able to do anything interesting with it, but for most part markup is a just a default style for

I would care more about markup if the browser would actually be able to do anything interesting with it, but for most part markup is a just a default style for an element, the semantic meaning is ignored. The <time> tag is about the last one I can think of that actually made a difference from the users perspective. There is also a lot of markup for really common tasks still missing, I'd like to see an <advertisment> and something to handle pagination at the browser level (rel="next" has been around for decades, but browser don't care). And more broadly, I'd really like to see much better support for long-form documents in HTML or at the very least native ePub support in the browser.