jQuery.expr[":"] is now jQuery.expr.pseudos

jQuery.expr[":"] is now jQuery.expr.pseudos

Using the jQuery 3.0.0. migration skript, i got the message jQuery.expr[":"] is now jQuery.expr.pseudos.
Seaching in jQuery API about  "pseudos", i got zero results.

I think, selectors like :hidden have changed?
How I have to write it now?

I cannot find annything in the API, that match to "pseudos".