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

What this snippet is

This is a set of custom CSS custom properties (CSS variables) used to control a small animation system. It defines:

  • –sd-animation: the animation name (here sd-fadeIn).
  • –sd-duration: animation length (250ms).
  • –sd-easing: timing function (ease-in).

How it works

A stylesheet or component reads these variables and applies a matching animation. Example behavior:

  • The element uses the sd-fadeIn keyframes.
  • The animation runs for 250 milliseconds.
  • The motion follows an ease-in curve (starts slow, then accelerates).

Example implementation

css
:root {–sd-animation: sd-fadeIn;  –sd-duration: 250ms;  –sd-easing: ease-in;}
.animated {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
/* fade-in keyframes */@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(8px); }  to   { opacity: 1; transform: translateY(0); }}

Usage tips

  • Change –sd-duration for snappier or slower reveals (e.g., 150ms or 400ms).
  • Swap easing for different feels: linear, ease-out, cubic-bezier(…).
  • Combine with animation-delay to stagger multiple elements.
  • Use animation-fill-mode: both to keep the end state after animation.

Accessibility note

Keep animations short and avoid continuous motion. Respect prefers-reduced-motion by disabling or simplifying animations when the user preference is set:

css
@media (prefers-reduced-motion: reduce) {  .animated { animation: none; opacity: 1; transform: none; }}

Conclusion

These CSS variables provide a concise, reusable way to control fade-in animations across components, making it easy to tune timing and easing consistently.

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