Tell HN: CSS class selectors may become case (in)sensitive

I discovered this behavior in chrome in an unfortunately long debugging session and maybe this saves someone time: When the encoding of a page is set to utf-8 in the http content type header, chrome treats css class selectors as case sensitive, but when utf-8 is declared in the !DOCTYPE header of the html file, they become case insensitive.

Curious if there is a back story of some spec that explains this or if this is just a random inconsistency