CSS 3 the all property is use to reset the element to its initial sate. this change is not effect on unicode-bidi properties .This property have three value which below i cover up very well.
It is a "shorthand" property which give ability to control the value of every CSS property in a single declaration,and it has no sub-properties. In this lesson we will show you how actually the all:; property of CSS3 works.

All property have three values first is initial second one is inherit and the last one unset. below

Values

Initial : its change and resets all element properties to their default values stats.

Inherit : is use to inherit the all styling of from its parent element's ,its inherit style deeply which not normally inheritable.

Unset: value is use to pass inherit value from child element to parent element . when there is no inheritable value available then it will automatically set to its initial value .

Make sure there are some of the properties which did not have any initial default value  like color and font-family etc. when all property initial or unset value is applied  then user agent will set default value as the initial value for these properties.

all: Initial;

all: Inherit;

all: Unset;

You can also checkout  CSS 3 align-content and align-item properties .

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