For anyone searching for similar answers, I've since learnt that this works
too:
$("#testDiv:not([input:checked])").hide();
The explanation (courtesy of Dave Methvin):
#testDiv // select an element with id=testDiv
:not( // as long as the following is not found:
[ // descendent elements containing
input // an input
:checked // that is checked
])
Notice that it's _very_ important to put the :not right after the id name.
If there was a space after the id it would select _descendants_ of
#testDiv that do not contain input:checked.
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