System Design

Dropdown Menu

Problem Statement

Design a highly reusable, accessible Dropdown Menu component that displays a list of actions. It appears when the user interacts with a trigger element (such as a button) and allows users to select an action from a floating list.

This is an excellent frontend system design question because a single dropdown component touches many core frontend concerns — component API design, accessibility, DOM positioning, event handling, focus management, and performanc...

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