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Ok, a while ago (a few seconds after I joined SE Network first time), I saw a thing which I found particularly interesting. If I want, I can hide a comment inside a post just by placing a < in front of it on a newline. For example, below is something hidden as of now, but you won't be able to see it:
But, If you click the edit button below, and see the markdown, its here!
So, is it an intentional feature?
Is it against the dense SE laws to hide such comments inside posts?
Sure, that's fine. It's rare, but sometimes this is actually helpful; for an example see the Markdown source of this answer.
The fact that this behaves like a comment is really just a side effect, because the HTML sanitizer will grab anything that starts with a < and ends with the next >, and if it doesn't match a white list, it will just remove it.
Even HTML comments (like <!-- foo -->), while being handled by the Markdown phase, will simply disappear during the sanitization phase because they're not whitelisted.
However, even though a single < would (mostly) behave the same way, you should use "real" HTML comments because
<foobar> into <foobar>) instead of just stripping them, so that they'd get displayed as plain text.
May 20, 2014 at 17:19
<!-- comment -->which is useful in some corner cases (and for code highlighting).