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

This article explains the meaning, usage, and best practices for the CSS custom properties shown in the title: -sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;. These variables are commonly used to control animations in component libraries or design systems that expose CSS custom properties (variables) for easy theming and runtime adjustments.

What these properties represent

  • -sd-animation: sd-fadeIn;
    Assigns a named animation preset. In design systems this often maps to a keyframes animation (here, a fade-in effect). The leading hyphen suggests it’s a custom, possibly vendor-like property used internally by a UI kit.

  • –sd-duration: 250ms;
    Sets the animation duration to 250 milliseconds. Short durations like this suit subtle UI transitions (tooltips, small element fades).

  • –sd-easing: ease-in;
    Sets the timing function; ease-in means the animation starts slowly and speeds up, making elements appear gently.

How to implement in CSS

Assume a design system exposes -sd-animation as a token; map it to actual animations with CSS variables and utility classes.

Example:

css
:root {–sd-duration: 250ms;  –sd-easing: ease-in;}
/* Define 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 to a modal:
html
<div class=“modal sd-animated” style=”–sd-duration: 300ms;”>  Modal content</div>
  • Faster hover reveal:
css
.button {  –sd-duration: 180ms;}

When to use these values

  • Use 250ms for quick but noticeable transitions (toasts, tooltips, dropdowns).
  • Use ease-in for elements entering the view; prefer ease-out or cubic-bezier() for exits or more natural motion.
  • Combine with transform (translateY/scale) and opacity for smoother perception.

Accessibility considerations

  • Respect prefers-reduced-motion: disable or reduce durations when users request reduced motion.
css
@media (prefers-reduced-motion: reduce) {  .sd-animated { animation: none; transition: none; }}

Tips and best practices

  • Keep durations consistent across similar UI patterns.
  • Use custom properties for theming and runtime overrides.
  • Use descriptive animation names (sd-fadeIn, sd-slideUp) and document them.

Conclusion

-sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in; is a compact way to control a fade-in animation via CSS custom properties. It provides flexibility for theming and runtime adjustments while keeping animation behavior consistent across a design system.

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