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These look like CSS custom properties (CSS variables) used to control a scroll-driven or component animation. Brief breakdown:

  • -sd-animation: sd-fadeIn;

    • Purpose: selects which animation to run (here, a predefined “sd-fadeIn” animation).
    • Usage: read by CSS or JavaScript to apply the corresponding keyframes or class.
  • –sd-duration: 0ms;

    • Purpose: sets the animation duration. “0ms” means no visible animation (instant).
    • Usage: used in animation shorthand or transition rules, e.g., animation-duration: var(–sd-duration);
  • –sd-easing: ease-in;

    • Purpose: sets the timing function (easing) for the animation.
    • Usage: animation-timing-function: var(–sd-easing);

Example CSS using these variables:

css
.element {–sd-animation: sd-fadeIn;  –sd-duration: 300ms; /* override default /  –sd-easing: ease-in;
  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
/ keyframes for sd-fadeIn */@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • With –sd-duration: 0ms the animation will not animate; set a positive duration to see motion.

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