Step-by-Step

These look like CSS custom properties (CSS variables) used to control a small animation system. Explanation:

  • –sd-animation: sd-fadeIn;

    • Name of the animation to apply (likely maps to a keyframe or animation class called “sd-fadeIn”).
  • –sd-duration: 250ms;

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

    • Timing function controlling acceleration (starts slowly then speeds up).

How they might be used in CSS:

.element {animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);}
/* example keyframes */@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • Variables allow per-element customization without repeating rules.
  • Ensure the referenced keyframes (sd-fadeIn) exist; otherwise animation won’t run.
  • You can override per-element or via media queries for responsiveness.
  • Use animation-fill-mode (e.g., forwards) if you want final state retained.

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