These look like CSS custom properties (variables) and a shorthand animation label used by a UI toolkit or design system. Briefly:
- -sd-animation: sd-fadeIn;
- Likely a custom property naming a predefined animation (here, “sd-fadeIn”). The stylesheet or JS reads this value and applies corresponding keyframes or animation classes.
- –sd-duration: 0ms;
- Duration of the animation. 0ms means no visible animation (instant).
- –sd-easing: ease-in;
- Timing function for the animation; “ease-in” makes the animation start slowly then speed up.
How they work together:
- A component reads -sd-animation to pick which keyframes to use, then reads –sd-duration and –sd-easing to set animation-duration and animation-timing-function (possibly also animation-delay, fill-mode, etc.). With duration 0ms the easing has no visible effect.
Usage tips:
- Set –sd-duration to a nonzero value (e.g., 200ms–500ms) to see the effect.
- Use meaningful animation names (sd-fadeIn, sd-slideUp) and document them.
- Provide prefers-reduced-motion fallback: set duration to 0ms when user prefers reduced motion.
- Ensure variable names are consistent (leading hyphen vs. double dash). Standard CSS custom properties use two dashes (e.g., –sd-animation). A single leading hyphen ( -sd-animation ) is nonstandard unless consumed by custom parser.
If you want, I can:
- convert these into concrete CSS examples,
- show how to implement sd-fadeIn keyframes,
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