Some of them have default ARIA settings which I can understand, but others (like <mark>) don't seem to come with any. I wish someone made a list of the practic

Some of them have default ARIA settings which I can understand, but others (like <mark>) don't seem to come with any. I wish someone made a list of the practical effects of using this markup. The spec is ridiculously vague about all of it to the point of being unreliable. For example, iirc <aside> gets a landmark that should only be a top landmark (like a sidebar), but the spec seems to hint you could use <aside> in the middle of a paragraph. Why would I do that when if it broke accessibility? I also think it sucks that semantic HTML has become de facto a poorly documented accessibility API...