Proper use of flex properties when nesting flex containers

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The scope of a flex formatting context is limited to a parent/child relationship.

This means that a flex container is always the parent and a flex item is always the child. Flex properties work only within this relationship.

Descendants of a flex container beyond the children are not part of flex layout and will not accept flex properties.

You will always need to apply display: flex or display: inline-flex to a parent in order to apply flex properties to the child.

There are certain flex properties that apply only to flex containers (e.g., justify-content, flex-wrap and flex-direction), and there are certain flex properties that apply only to flex items (e.g., align-self, flex-grow and flex).

However, flex items can also be flex containers. In such cases the element can accept all flex properties. Being that each property performs a different function, there is no internal conflict and nothing needs to be overridden.

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