Fastest

Those are CSS custom properties (CSS variables) likely used by a library or component for controlling an animation. Breakdown:

  • –sd-animation: sd-fadeIn;

    • Name of the animation to apply (likely mapped to a keyframes rule called sd-fadeIn).
  • –sd-duration: 0ms;

    • Duration of the animation; here set to 0ms so the animation will have no visible duration (instant).
  • –sd-easing: ease-in;

    • Timing function controlling the animation’s acceleration curve; “ease-in” starts slow and speeds up.

How they’re used (example):

css
.element {animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);}@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(8px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • p]:inline” data-streamdown=“list-item”>These variables allow easy theming per-component or runtime overrides.

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