Hamburger Menu Animation

This snippet demonstrates a modern hamburger menu enriched with polished micro-interactions. When clicked, the classic three-line icon gracefully transforms into an “X”, delivering clear and intuitive visual feedback to the user.

Implementation Code

This fluid animation is powered by a straightforward combination of HTML, CSS, and minimal JavaScript.

<!-- HTML -->
<button class="hamburger-menu" aria-label="Menu" aria-expanded="false">
  <span class="line line-1"></span>
  <span class="line line-2"></span>
  <span class="line line-3"></span>
</button>

/* CSS */
.hamburger-menu {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 48px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  position: relative;
  transition: transform 0.3s ease;
}

.hamburger-menu:focus-visible {
  outline: 2px solid #3b82f6;
  outline-offset: 6px;
  border-radius: 4px;
}

.hamburger-menu:hover {
  transform: scale(1.05);
}

.hamburger-menu .line {
  display: block;
  width: 100%;
  height: 4px;
  background-color: #1e293b;
  border-radius: 9999px;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
}

/* Active (expanded) state styles */
.hamburger-menu.active .line-1 {
  transform: translateY(14px) rotate(45deg);
  background-color: #ef4444;
}

.hamburger-menu.active .line-2 {
  opacity: 0;
  transform: translateX(-20px);
}

.hamburger-menu.active .line-3 {
  transform: translateY(-14px) rotate(-45deg);
  background-color: #ef4444;
}

// JavaScript
const hamburger = document.querySelector('.hamburger-menu');

hamburger.addEventListener('click', function() {
  // Toggle active class
  this.classList.toggle('active');
  
  // Accessibility support (update aria-expanded)
  const isExpanded = this.classList.contains('active');
  this.setAttribute('aria-expanded', isExpanded);
});

Features & Explanation

Fluid Animation: The implementation uses a cubic-bezier easing function to produce a natural, organic transition, avoiding stiff or mechanical movements.
Accessibility (a11y): Attributes like aria-label and aria-expanded are explicitly defined to communicate the menu’s toggled state to screen readers. Additionally, :focus-visible is employed to provide a distinct focus ring for keyboard navigation without compromising mouse-click aesthetics.
Optimized Performance: The animation relies exclusively on hardware-accelerated properties (transform and opacity), effectively preventing costly browser repaints and reflows for consistently smooth rendering at 60fps.