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Diagrams

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Those are CSS custom properties (CSS variables) likely used by a component or animation system. Briefly:

  • -sd-animation: sd-fadeIn;

    • Purpose: selects which animation to run (here, “sd-fadeIn”).
    • Usage: the component or stylesheet reads this variable to apply corresponding keyframes or classes.
  • –sd-duration: 0ms;

    • Purpose: sets the animation duration to 0 milliseconds (instant, no visible motion).
    • Effect: with 0ms the animation completes immediately; transitions/keyframes won’t be perceptible.
    • Note: some browsers still apply end-state styles; some libraries interpret 0ms as “disabled.”
  • –sd-easing: ease-in;

    • Purpose: sets the timing-function (easing) for the animation.
    • Effect with 0ms: easing has no visible effect when duration is 0ms.
    • Common values: linear, ease, ease-in-out, cubic-bezier(…).

Example usage:

.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); }}

Recommendations:

  • If you want a visible fade-in, set –sd-duration to a positive value (e.g., 200ms).
  • If you intend to disable animation, 0ms is fine; alternatively use animation: none.

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