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-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;

This article explains the CSS custom properties shown in the title, what they do, when to use them, and how to avoid common pitfalls.

What these properties mean

  • –sd-animation: A custom property naming an animation variant (here sd-fadeIn). It likely maps to a keyframe animation or a set of styles consumed by component code.
  • –sd-duration: The animation duration in milliseconds (0ms means instant/no visible transition).
  • –sd-easing: The timing function (ease-in speeds up at the end).

These are not standard CSS animation properties but CSS variables (custom properties) that a UI library or component uses to configure actual animations.

How they’re typically used

A component’s stylesheet or script reads those variables to apply animations. Example pattern:

css
:root {–sd-animation: sd-fadeIn;  –sd-duration: 300ms;  –sd-easing: ease-in-out;}
.my-element {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}

And keyframes:

css
@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(8px); }  to   { opacity: 1; transform: translateY(0); }}

Practical notes and recommendations

  • Setting –sd-duration: 0ms disables the visible transition; use a positive duration (e.g., 200ms–500ms) for perceptible motion.
  • Use meaningful variable names when creating your own design system (e.g., –motion-fade-duration).
  • Prefer prefers-reduced-motion media query to respect accessibility:
css
@media (prefers-reduced-motion: reduce) {  :root { –sd-duration: 0ms; }}
  • Keep easing consistent across similar interactions; ease-in-out or cubic-bezier values give smooth results.
  • If the library expects specific variable names (–sd-*), override them at component scope to avoid global side effects.

Troubleshooting

  • No animation? Ensure keyframes are defined and names match the variable value.
  • Instant jump despite nonzero duration: check for animation-play-state, or conflicting transitions overriding animation.
  • Performance issues: prefer opacity and transform; avoid animating layout-triggering properties like width/height/top/left when possible.

Conclusion

The snippet represents a convenient way for components to expose animation settings through CSS variables. Use nonzero durations for visible effects, respect reduced-motion preferences, and prefer transform/opacity for performance.

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