The other sections each look at one kind of decision on its own. This one puts them all together. Each essay takes a single component and builds it properly, from the first rough version to one I'd be happy to ship, with every choice along the way explained.
These are the components that look simple until you build them. A toast has to appear, stack, wait and get out of the way. A dropdown has to position itself, handle submenus and work from the keyboard. Each essay links back to the ideas it borrows from Foundations, Interaction and Motion, so you can see where every detail comes from.
A small message that has to appear, stack, wait and leave without ever getting in the way.
Positioning, submenus, keyboard and motion: the menu that ties half of Interaction together.
A sliding indicator is the easy part. Here's everything else.
A bottom sheet that follows your finger, snaps where it should, and lets go when you do.