[niconii]

In this comment section? Are you talking about stuff like the example I used earlier?

    <p><div></div></p>

Yes, obviously this is bad and nonsensical HTML. Under no circumstances does it make sense to have a div inside a p. In fact, the above doesn't even work, being parsed as

    <p></p><div></div></p>

But the intention of this example is not to show good HTML. The point is that many people have only a very basic understanding of HTML syntax, under the impression that

    <foo><bar></bar></foo>

works for any elements, because there's a <foo> and a </foo> so clearly anything inside it must be inside the foo element, right? But this is not the case for all elements. HTML's syntax is more complicated than that. My example was only intended to correct this misconception, not to demonstrate semantically-correct HTML, and that goes for other similar examples made by other people in the comments too.