and

Those look like custom CSS properties and a shorthand animation declaration—likely part of a design system or a CSS-in-JS pattern. Briefly:

-sd-animation: sd-fadeIn;
- Appears to be a custom property naming convention (prefixed with -sd-). The value “sd-fadeIn” likely references a named animation or a token in a component library rather than a native CSS keyword.
–sd-duration: 0ms;
- Custom property defining the animation duration. 0ms means the animation will complete instantly (no visible transition).
–sd-easing: ease-in;
- Custom property for the timing function. “ease-in” means the animation starts slowly and speeds up.

How they’re typically used:

A component’s stylesheet or a CSS-in-JS system defines these variables (often on an element or :root) and uses them when applying animations, e.g.:
```
animation-name: var(–sd-animation);animation-duration: var(–sd-duration);animation-timing-function: var(–sd-easing);
```
If –sd-duration is 0ms, a fadeIn will not show—element will jump to final state immediately. To see the fade, set a positive duration (e.g., 250ms).
The -sd- prefix may indicate a theme or scoped namespace; ensure consistent naming to avoid clashes.

Practical notes:

Confirm “sd-fadeIn” is defined as an @keyframes rule (or mapped in your framework). Example:

@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(4px); }  to { opacity: 1; transform: translateY(0); }}

Use sensible durations (150–400ms) and easing (ease, ease-out, cubic-bezier) for UI animations.

For accessibility, prefer reduced-motion media query:

@media (prefers-reduced-motion: reduce) {  –sd-duration: 0ms;}

If you want, I can: (pick one)

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