These are CSS custom properties (CSS variables) typically used to control an animation. Breakdown:

  • -sd-animation: sd-fadeIn;

    • Names the animation to apply (likely a keyframe animation called “sd-fadeIn”).
  • –sd-duration: 250ms;

    • Sets the animation duration to 250 milliseconds.
  • –sd-easing: ease-in;

    • Sets the timing function to “ease-in” (starts slow, then accelerates).

Usage example (assumes a CSS variable-based animation system):

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

Notes:

  • Variable names must match (leading hyphen vs double hyphen). Standard custom properties use two hyphens (–name). Single-leading-hyphen (-sd-animation) is unconventional and may not be supported as a custom property in browsers unless used intentionally by a framework; prefer –sd-animation.

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