composition
Patterns
Compositions, not new primitives. Form layout, the overlay stack, and the app shell. A kit screen is not a pattern.
patterns
A native form. Fieldset groups related settings. A checkbox group owns the set. A separator divides regions. Hint or error, never both.form→Scrim, dialog, tooltip, toast. A dialog is present or it is not. Toasts sit above the modal.overlay→The app frame stacks at 672. The language site stacks at 1312. Section tabs wrap at 1056. A long catalog is a select.shell→