@mia there are/have been browsers that have played around with those kind of ideas, although I forgot most of the names.
Opera used to be excellent at this before going to shit several years ago, and it was actually pushing for a more accessible distributed web before going down with Opera Unite (my writeup: <https://wok.oblomov.eu/tecnologia/opera-requiem-3/>)
Vivaldi is the closest we have to such a thing today, at least UI wise, even though it's beholden to Google's Blink engine.