Dropdown Css -

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

.dropdown__trigger:focus-visible outline: 2px solid #3b82f6; outline-offset: 2px;

.dropdown__menu li a:hover, .dropdown__menu li a:focus-visible background-color: #f1f5f9; outline: none; dropdown css

(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:

:focus-within keeps the dropdown open when tabbing into menu items, enabling full keyboard accessibility. 4. Arrow Rotation & State .dropdown[data-open="true"] .dropdown__arrow transform: rotate(180deg); @media (max-width: 768px)

.dropdown__menu position: absolute; top: 100%; left: 0; min-width: 160px; margin: 0; padding: 0.5rem 0; background: white; border-radius: 8px; box-shadow: 0 8px 20px rgba(0,0,0,0.15); list-style: none; opacity: 0; visibility: hidden; transform: translateY(-10px); transition: opacity 0.2s ease, visibility 0.2s, transform 0.2s ease; z-index: 1000;

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. This paper presents a CSS-only approach to building

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