class="<valid chars here>"

I have a question.

Is that class values valid?

class="my-system"

class="my_system"

class="my/System"

class="oscar.vives@foo.bar"

is class case-sensitive?

class="ultraTile"
class="ultratile"

I know theres a EBNF syntax on the spec, but after finishing Doom2 in
nightmare mode I have lost almost all of my gray cells, and I get
lost, hence,.. I am here to ask humans.


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