A page box whose subtree establishes the page float area of a page. Which box becomes the area's container is fixed by the page box tree: the page master itself for -epubx-page-master, the page area partition for @page rules.
@page
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The child whose subtree establishes the area, or null when this box is the container itself.
A page box whose subtree establishes the page float area of a page. Which box becomes the area's container is fixed by the page box tree: the page master itself for -epubx-page-master, the page area partition for
@pagerules.