It turns out
revert is the one I wanted all along.
It rolls back styles to the expected browser default for each element,
rather than using the specification default for each property.
I’ve often used
unset in my CSS –
global keywords that can be applied to any property.
The difference is small, but important:
unset allows inheritance,
initial does not.
But then Firefox implemented
revert and I was confused –
how is this one different from the others?!