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The way the copy-on-write stuff works, and the way that we have to apply properties from most specific to less specific guarantees that always that we're going to inherit an inherited property, or reset a reset property, we have already the right value on the style. Revert relies on that, so there doesn't seem to be a reason to not use that fact more often and skip useless work earlier. Font-size is still special of course... I think I have a way to move the specialness outside of the style, but piece by piece. Differential Revision: https://phabricator.services.mozilla.com/D21882 --HG-- extra : moz-landing-system : lando