Well, you sure can write plain HTML pages without any of the above, just like you can write desktop applications using Assembly. But does it make sense? Not really.
Also, it's simply not true that you can specify all rendering information in HTML, there are a lot of things like media queries or pseudo-class selectors like ":hover" that can't be inlined and need to reside in a stylesheet.
Also, it's simply not true that you can specify all rendering information in HTML, there are a lot of things like media queries or pseudo-class selectors like ":hover" that can't be inlined and need to reside in a stylesheet.