The revert CSS keyword rolls back the cascade so that a property takes on the value it would have had if there were no styles in the current style origin (author, user, or user-agent). Thus, it resets the property to the default value established by the user-agent stylesheet (or by user styles, if any exist). It can be applied to any CSS property, including the CSS shorthand all.
Browser compatibility: только Сафари
Так и живём

https://developer.mozilla.org/en-US/docs/Web/CSS/revert