The CSS display property has been upgraded to a two-valued syntax, something like display: outside inside, where "outside" refers to the display of the element's outer box and "inside" refers to the inside box that holds the element's children.
The two-valued syntax is not a new concept actually. It was always there from the begining, but now it is formally broken down into subparts for further clarity.
The 2-valued syntax will allow to make new layouts that were not possible before.
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