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Using CSS Custom Properties for Animation: ”-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;”

Custom properties (CSS variables) make animation systems flexible and maintainable. The declaration

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

appears to be part of a design system or component library that uses a prefixed custom property (-sd-animation) to select a named animation and additional properties to parameterize it. Below is a concise guide to what these properties do, how to implement them, and best practices.

What these properties mean

  • -sd-animation: sd-fadeIn — selects a named animation (likely defined elsewhere as keyframes for “sd-fadeIn”). The vendor-like prefix (-sd-) suggests this is part of a scoped design system.
  • –sd-duration: 0ms — sets the animation duration. A value of 0ms disables visible animation (instant change).
  • –sd-easing: ease-in — sets the timing function that controls animation acceleration.

How the system likely works

  1. Keyframes: Somewhere in the stylesheet there’s a keyframes rule for sd-fadeIn, e.g.:
css
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
  1. Utility or component rule: A rule reads the -sd-animation custom property and applies animation properties using the parameter variables:
css
.element {  animation-name: var(-sd-animation);  animation-duration: var(–sd-duration, 200ms);  animation-timing-function: var(–sd-easing, ease);  animation-fill-mode: both;}
  1. Overrides: Components or consumers override variables to alter behavior per instance.

Practical examples

  • Disable animation temporarily:
css
.card { –sd-duration: 0ms; }
  • Faster fade-in with a different easing:
css
.toast {  -sd-animation: sd-fadeIn;  –sd-duration: 150ms;  –sd-easing: cubic-bezier(.2,.9,.3,1);}

Accessibility considerations

  • Respect prefers-reduced-motion:
css
@media (prefers-reduced-motion: reduce) {  .element { –sd-duration: 0ms; }}
  • Avoid zero-duration for content that benefits from motion cues; use reduced motion only when requested.

Best practices

  • Use clear, consistent variable names and defaults.
  • Provide sensible fallbacks when reading variables.
  • Document available named animations and accepted units/values.
  • Keep keyframes short and performant (avoid heavy paint/layout changes).

Conclusion Using prefixed CSS custom properties to select animations and parameterize duration/easing provides a powerful, composable animation API for components. The example values shown—sd-fadeIn, 0ms, ease-in—illustrate selecting an animation, disabling its motion, and specifying easing. Implement sensible defaults and respect reduced-motion preferences to balance polish with accessibility.

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