Sure, so which subset of HTML are we talking about? Because unless I'm misremembering things, HTML 2.0 (literally the first version intended to be a standard g

Sure, so which subset of HTML are we talking about? Because unless I'm misremembering things, HTML 2.0 (literally the first version intended to be a standard going forwards) came out exactly the same year that JS dropped in a commercial browser (1995), and superseded the previous HTML and HTML+ markups. So surely you don't mean HTML with things like file uploads, or GIF support. Because that's not "vanilla" in your world. /s