Miriam Suzanne has a Mozilla Developer video on the subject. The
revert value is fairly new, supported in Firefox and Safari, but not yet in Chrome-world. We've already got a couple of related keywords that work on any property which are meant to help control inheritance and reset values.
The difference is small, but important:
unsetallows inheritance, while
Miriam makes the case that
revert is actually the most useful of them because it "takes user and user-agent … Read article