The page wrapped in its layout and view providers.
The page alone.
The page's loader result.
OptionalheadThe merged head, layout first, page last.
OptionallayoutThe layout the page asked for.
What a hydrating renderer serializes: the pieces a second render needs.
Everything a renderer needs to display one resolved route.
Two shapes come out of the same work: the page wrapped in its layout and providers, and the page alone for a renderer that supplies its own chrome. Which one is used, and what is done with it, is the renderer's business.