These look like CSS custom properties (CSS variables) used to control a component’s animation. Explanation:
- –sd-animation: sd-fadeIn;
- Purpose: Names the animation to run (here, a custom animation called “sd-fadeIn”). The component’s stylesheet or JS likely reads this to apply a matching @keyframes or class.
- –sd-duration: 0ms;
- Purpose: Sets the animation length. 0ms means no visible animation (instant).
- –sd-easing: ease-in;
- Purpose: Controls the timing function for the animation; “ease-in” starts slowly and speeds up.
How they’re typically used
- In CSS:
- A component reads these variables to build an animation shorthand, e.g.:
animation: var(–sd-animation) var(–sd-duration) var(–sd-easing) both; - @keyframes must define the named animation (sd-fadeIn):
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }}
- A component reads these variables to build an animation shorthand, e.g.:
- In JS frameworks:
- Components may set or override these variables inline (style attributes) to change animation behavior per-instance.
Common practical notes
- Duration 0ms disables the animation; use a positive time (e.g., 250ms) to see motion.
- Provide fallbacks if the custom property is unset:
animation: var(–sd-animation, sd-fadeIn) var(–sd-duration, 250ms) var(–sd-easing, ease); - For accessibility, prefer reduced-motion media query:
@media (prefers-reduced-motion: reduce) { .component { animation-duration: 0ms !important; }}
If you want, I can:
- show a complete example component with these variables wired up, or
- convert the values to a working CSS snippet with a nonzero duration. Which would you prefer?
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