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

These three CSS custom properties—-sd-animation, –sd-duration, and –sd-easing—are simple, readable tokens you can add to your component styles to control a small, reusable animation pattern. Below is a concise guide showing what each property represents, how to use them together, and a minimal implementation you can drop into a project.

What each property does

  • -sd-animation: the animation name or shorthand identifier (example value: sd-fadeIn) applied to the element.
  • –sd-duration: the animation duration (example value: 250ms).
  • –sd-easing: the animation timing function (example value: ease-in).

Minimal CSS implementation

css
:root {–sd-duration: 250ms;  –sd-easing: ease-in;}
/* define the keyframes for sd-fadeIn /@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/ utility that reads the custom properties */.sd-animated {  animation-name: var(–sd-animation, sd-fadeIn);  animation-duration: var(–sd-duration, 250ms);  animation-timing-function: var(–sd-easing, ease-in);  animation-fill-mode: both;}

Usage examples

  • Apply default fade-in:
html
<div class=“sd-animated”>Hello</div>
  • Override duration and easing on a specific element:
html
<div class=“sd-animated” style=”–sd-duration:500ms; –sd-easing:cubic-bezier(.2,.9,.2,1);”>  Slower, smoother fade</div>

Tips

  • Keep motion preference in mind: respect reduced-motion by disabling animations when the user prefers reduced motion.
  • Use logical defaults in :root so components work without inline overrides.
  • Combine with opacity and transform for smooth, performant animations.

Respect reduced-motion

css
@media (prefers-reduced-motion: reduce) {  .sd-animated { animation: none; transition: none; }}

This pattern makes animations configurable and consistent across components while keeping the CSS declarative and easy to override.

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