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These look like CSS custom properties and a custom animation shorthand likely used by a design system or component library. Briefly:

  • -sd-animation: sd-fadeIn;

    • Likely a custom property specifying which named animation to apply (here, “sd-fadeIn”).
  • –sd-duration: 0ms;

    • Sets the animation duration to 0 milliseconds effectively disabling visible animation so the change is instantaneous.
  • –sd-easing: ease-in;

    • Sets the animation timing function to “ease-in”, which accelerates from slow to fast.

Practical notes:

  • If duration is 0ms, easing has no visible effect.
  • To enable the fade-in, set –sd-duration to a positive value (e.g., 300ms).
  • Ensure the animation name (sd-fadeIn) is defined in @keyframes or by the library; otherwise nothing will run.
  • Example CSS usage:
    .my-element {animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);}

That’s all — change the duration to see the fade-in.

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