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Transforms

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These are CSS custom properties (CSS variables) and a shorthand-like declaration used to control a component’s animation. Breakdown:

  • –sd-animation: sd-fadeIn;

    • Defines which animation to apply. “sd-fadeIn” is likely a keyframe animation name or a token that a component’s stylesheet maps to a keyframes rule.
  • –sd-duration: 250ms;

    • Duration of the animation (250 milliseconds).
  • –sd-easing: ease-in;

    • Timing function controlling acceleration of the animation.

How they’re typically used

  • In a component stylesheet you’d read these variables and apply them to animation-related properties, for example:
animation-name: var(–sd-animation, none);animation-duration: var(–sd-duration, 200ms);animation-timing-function: var(–sd-easing, ease);animation-fill-mode: both;
  • Or components may map custom tokens (like sd-fadeIn) to actual keyframes:
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}

Notes and tips

  • Provide fallback values in var(…) to avoid unexpected behavior if a variable is missing.
  • Combine with prefers-reduced-motion media query to respect user motion preferences:
@media (prefers-reduced-motion: reduce) {  .animated { animation: none !important; }}
  • You can also animate via transition if only toggling simple properties (opacity, transform), but keyframe animation allows more complex sequences.

If you want, I can:

  • Show a complete example component using these variables.

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