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Understanding the CSS Custom Properties: -sd-animation, –sd-duration, and –sd-easing

These three custom properties are used to control a small animation shorthand and its timing/easing in CSS. Here’s a concise explanation and a practical example you can drop into your stylesheet.

What each property does

• -sd-animation: holds the animation name or shorthand (here sd-fadeIn indicates a fade-in animation).
• –sd-duration: sets the animation length (e.g., 250ms).
• –sd-easing: sets the animation timing function (e.g., ease-in).

Example implementation

:root {–sd-duration: 250ms;  –sd-easing: ease-in;  –sd-animation: sd-fadeIn;}
/* Define the keyframes referenced by the custom property name /@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/ Apply to elements using the custom properties /.animated {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;  / optional performance and smoothing /  backface-visibility: hidden;  will-change: opacity, transform;}
/ Example: staggered usage */.animated.delay-1 { animation-delay: 50ms; }.animated.delay-2 { animation-delay: 100ms; }

Usage tips

• Use short durations (150–350ms) for UI micro-interactions; 250ms is a good default.
• Prefer hardware-accelerated properties (opacity, transform) for smoother animations.
• Combine with animation-fill-mode: both to retain end state.
• Control via variables for theming or accessibility: set duration to 0ms for users who prefer reduced motion.

Accessibility

Respect user preferences:

@media (prefers-reduced-motion: reduce) {  .animated { animation: none !important; }}

This setup gives you a reusable, accessible fade-in animation controlled entirely with custom properties for easy theming and maintenance.