Css - Dropdown

Abstract Dropdown menus remain a critical UI component for navigation and form inputs. This paper presents a CSS-only approach to building accessible, responsive, and visually consistent dropdowns without JavaScript, leveraging pseudo-classes, transitions, and the :focus-within selector. 1. HTML Structure A semantic foundation ensures accessibility and styling hooks.

.dropdown:hover .dropdown__menu, .dropdown:focus-within .dropdown__menu, .dropdown__menu:hover opacity: 1; visibility: visible; transform: translateY(0); dropdown css

.dropdown__menu li a display: block; padding: 0.5rem 1rem; color: #1e293b; text-decoration: none; transition: background 0.15s; Abstract Dropdown menus remain a critical UI component

.dropdown__trigger:focus-visible outline: 2px solid #3b82f6; outline-offset: 2px; .dropdown__menu:hover opacity: 1

@media (max-width: 768px) .dropdown display: block; .dropdown__menu position: static; box-shadow: none; border: 1px solid #e2e8f0; margin-top: 0.5rem;

(JavaScript can toggle data-open ; CSS-only arrow change requires :focus-within plus sibling selectors — omitted for brevity.) For mobile, convert absolute positioning to full-width block: