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See CSS2 Design Principles, Evolution of CSS Layout: Principles, Designing CSS slide deck for higher-level design principles.
; Transparency Principle : Inserting an unstyled block in a block formatting context (as sibling, parent, child or intermediary) / unstyled inline in an inline formatting context should have no effect on styling. ; Lea Verou Principle : If it can be unambiguously reordered, it should be reorderable. ; Pass-through Auto-sizing Principle : `auto` as a size generally passes down any min/max-content constraints, and passes up through it the min/max-content contribution