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-sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;

These custom CSS properties offer a compact, reusable way to define a simple fade-in animation. Below is a concise guide covering what each property does, how to implement them, and tips for practical use.

What they mean

  • -sd-animation: sd-fadeIn; — selects a named animation (here, “sd-fadeIn”) that will be applied.
  • –sd-duration: 250ms; — sets the animation length to 250 milliseconds.
  • –sd-easing: ease-in; — sets the animation timing function to ease-in (starts slow, then accelerates).

Example implementation

  1. Define the CSS custom properties and animation keyframes:
css
:root {–sd-duration: 250ms;  –sd-easing: ease-in;  -sd-animation: sd-fadeIn;}
@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
  1. Apply them to an element, using the shorthand animation property:
css
.fade-in {  animation-name: var(-sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
  1. HTML:
html
<div class=“fade-in”>Content that fades in</div>

Variations & tips

  • Use different durations (e.g., 150ms for micro-interactions, 400–600ms for more prominent entrances).
  • Combine easing functions: cubic-bezier(…) for custom motion.
  • Add animation-delay for staggered sequences.
  • Prefer transform and opacity for performant animations (GPU-accelerated).
  • Use prefers-reduced-motion media query to disable or simplify animations for accessibility:
css
@media (prefers-reduced-motion: reduce) {  .fade-in { animation: none; opacity: 1; transform: none; }}

When to use

  • Micro-interactions (toasts, modals, subtle entrance effects).
  • Loading states where content should gently appear.
  • Enhancing perceived responsiveness without overwhelming users.

Summary

These variables make a consistent fade-in effect easy to apply and adjust across a site. Define keyframes once, tune duration and easing via custom properties, and respect accessibility preferences for the best user experience.

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