@Tiago: One per year or so? Not really "clutter".

"This is a low-quality answer. It doesn't explain how to install or run xyzzy, it just says to do it. This isn't helpful for people in the future." I disagree. Explaining how to install a package is way out of scope. However, to be a good answer, it should have explained why xyzzy fixes the problem.

This answer contradicts itself. The question is either off-topic or it is not. As you point out, trivial "typo" nonsense is off-topic. So it should be closed. And then your "it should stay" doesn't apply and the post should not be undeleted. So what are you saying, really?

This is not HTML. HTML is markup. (And not Markdown, either!) This is the rendered output.