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The problem with hoarding is you end up living off your reserves. Eventually, you’ll become stale. If you give away everything you have, you are left with nothing. This forces you to look, to be aware, to replenish. . . . Somehow the more you give away, the more comes back to you.
Paul Arden

<display-internal>

Some layout models such as table and ruby have a complex internal structure, with several different roles that their children and descendants can fill. This page defines those "internal" display values, which only have meaning within that particular layout mode.
<display-internal> css reference