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The currentColor keyword represents the calculated value of the element's color property. It allows to make the color properties inherited by properties or child's element properties that do not inherit it by default.

It can also be used on properties that inherit the calculated value of the element's color property and will be equivalent to the inherit keyword on these elements, if any.

The inherit CSS-value causes the element for which it is specified to take the computed value of the property from its parent element. It is allowed on every CSS property.

For inherited properties, this reinforces the default behavior, and is only needed to override another rule. For non-inherited properties, this specifies a behavior that typically makes relatively little sense and you may consider using initial instead, or unset on the all property.

The initial CSS keyword applies the initial value of a property to an element. It is allowed on every CSS property and causes the element for which it is specified to use the initial value of the property.

The transparent keyword represents a fully transparent color, i.e. the color seen will be the background color. Technically, it is a black with alpha channel at its minimum value and is a shortcut for rgba(0,0,0,0).

The unset CSS keyword is the combination of the initial and inherit keywords. Like these two other CSS-wide keywords, it can be applied to any CSS property, including the CSS shorthand all. This keyword resets the property to its inherited value if it inherits from its parent or to its initial value if not. In other words, it behaves like the inherit keyword in the first case and like the initial keyword in the second case.