The all shorthand CSS property resets all of an element's properties except unicode-bidi, direction, and CSS Custom Properties. It can set properties to their initial or inherited values, or to the values specified in another cascade layer or stylesheet origin.
Ref.: https://developer.mozilla.org/en-US/docs/Web/CSS/all
inherit : CSS.Internal.Property
Specifies that all the element's properties should be changed to their inherited values.
initial : CSS.Internal.Property
Specifies that all the element's properties should be changed to their initial values.
revert : CSS.Internal.Property
Specifies behavior that depends on the stylesheet origin to which the declaration belongs:
revertLayer : CSS.Internal.Property
Specifies that all the element's properties should roll back the cascade to a previous cascade layer, if one exists. If no other cascade layer exists, the element's properties will roll back to the matching rule, if one exists, in the current layer or to a previous style origin.
unset : CSS.Internal.Property
Specifies that all the element's properties should be changed to their inherited values if they inherit by default, or to their initial values if not.