Understanding

These are CSS custom properties (CSS variables) used to parameterize an animation. Briefly:

  • –sd-animation: sd-fadeIn;

    • Likely stores the animation name (e.g., a keyframes name or a shorthand that a component library recognizes).
    • Example use: animation-name: var(–sd-animation);
  • –sd-duration: 250ms;

    • Controls how long the animation runs. Use with animation-duration: var(–sd-duration);
  • –sd-easing: ease-in;

    • Defines the timing function (easing) for the animation. Use with animation-timing-function: var(–sd-easing);

Example usage (vanilla CSS):

css
.element {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(6px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • These variables let you change animation behavior without modifying CSS rules for each element.
  • Ensure the animation name matches a defined @keyframes rule or is handled by your framework.

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