Community-maintained principles reviewed before publication and retrieved as Agent design constraints.
Edge-to-Edge vs Contained Layout turns a frequent interface judgment into an executable constraint before generation.
Page width is an information architecture decision; not every region belongs in the same max-width container.84%Visual Foundationscontainer / boundaryContainers express objects and regions; they should not become the default decoration.
Borders, surface colors, and shadows all communicate hierarchy; too many containers fragment the page.82%