FlexDirectionStyle

The flex container's main-axis is the same as the block-axis. The main-start and main-end points are the same as the before and after points of the writing-mode. --MDN

Behaves the same as column but the main-start and main-end are permuted. --MDN

The flex container's main-axis is defined to be the same as the text direction. The main-start and main-end points are the same as the content direction. --MDN

Behaves the same as row but the main-start and main-end points are permuted. --MDN

The inherit CSS keyword causes the element for which it is specified to take the computed value of the property from its parent element. --MDN

The initial CSS keyword applies the initial (or default) value of a property to an element. --MDN

The revert CSS keyword reverts the cascaded value of the property from its current value to the value the property would have had if no changes had been made by the current style origin to the current element. --MDN

The unset CSS keyword resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not. In other words, it behaves like the inherit keyword in the first case, when the property is an inherited property, and like the initial keyword in the second case, when the property is a non-inherited property. --MDN