2020
2 featuresThe revert CSS keyword resets any property to its previous default, provided by either the user or browser stylesheets. For example, setting display: revert on a <div> will likely result in display: block, the browser default style. This is often confused with initial.
The all CSS property is a shorthand for all CSS properties, except for direction and unicode-bidi. It accepts only the keywords for explicit defaulting (such as initial and inherit), since they are the only values supported on all CSS properties.
2016
1 featuresThe unset keyword resets any CSS property, removing any values previously set by the author, user, or browser. Inherited properties (like color) reset to the parent element's computed value. Non-inherited properties (like display) reset to the specified initial value (inline).
2015
2 featuresThe initial keyword resets any CSS property to its initial value as defined by the specification. For example, the initial value of the display property is inline, regardless of the element being styled. Not to be confused with revert, which resets to the user or browser default style.
The inherit keyword resets any CSS property to the computed value of that property from the parent element.