Those are CSS custom properties (variables) likely used by a design system or animation utility to control a simple fade-in animation. Explanation:
- –sd-animation: sd-fadeIn;
- Names the animation to apply (likely defined elsewhere as a keyframes rule named “sd-fadeIn” or mapped by a library).
- –sd-duration: 250ms;
- Duration of the animation (250 milliseconds).
- –sd-easing: ease-in;
- Timing function that controls acceleration (ease-in starts slow and speeds up).
How they’d be used (example pattern):
- A library or component reads these variables and sets animation properties, e.g.:
- animation-name: var(–sd-animation);
- animation-duration: var(–sd-duration);
- animation-timing-function: var(–sd-easing);
If the keyframes aren’t defined, define them yourself:
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }}Quick example applying the variables:
.element { –sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in; animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;}Swap values to customize: change duration (e.g., 500ms), easing (e.g., cubic-bezier(.2,.8,.2,1)), or animation name to use different keyframes.
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