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These are CSS custom properties (variables) likely used by a design system or component library to control an animation. Explanation:

• -sd-animation: sd-fadeIn;
  • Selects the animation type or keyframe set named “sd-fadeIn”. The component or stylesheet uses this variable to decide which animation to apply (e.g., fading opacity from 0 → 1).
• –sd-duration: 250ms;
  • Duration of the animation: 250 milliseconds.
• –sd-easing: ease-in;
  • Timing function controlling animation acceleration: “ease-in” starts slowly and speeds up.

How they’re typically used in CSS:

• Define defaults on a component or :root:
  :root {–sd-animation: sd-fadeIn;  –sd-duration: 250ms;  –sd-easing: ease-in;}

• Apply to an element by referencing variables and mapping them to animation properties:
  .anim {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
  @keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(4px); }  to { opacity: 1; transform: translateY(0); }}

Tips:

• Use animation-delay, animation-iteration-count, and animation-fill-mode as needed.
• For complex systems, consider using @property (where supported) for typed custom properties.