Anatomy
Shared shell parts
Brand lockup, primary navigation region, overflow behavior, utility region, and mobile navigation surface stay in one governed family.
The shared shell contract for brand lockup, primary navigation, overflow handling, mobile navigation collapse, and account affordances.
Live Surfaces
Use the pattern page for intent and the linked live surfaces for rendered proof.
Contract Highlights
Anatomy
Brand lockup, primary navigation region, overflow behavior, utility region, and mobile navigation surface stay in one governed family.
Responsive Rule
Desktop overflow and mobile collapse should come from actual fit pressure rather than page-local breakpoint guesses.
Adoption
This pattern exists so app surfaces can inherit one shell grammar instead of rebuilding top navigation for each page family.