Those look like CSS custom properties (CSS variables) used to configure an animation. Explanation:
- –sd-animation: sd-fadeIn;
- Sets the animation name or type to “sd-fadeIn” (a custom animation keyframe or an identifier used by a component/library).
- –sd-duration: 250ms;
- Duration of the animation: 250 milliseconds.
- –sd-easing: ease-in;
- Timing function controlling acceleration: “ease-in” (slow start, faster end).
Usage example (CSS):
css
.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);}@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); }}
Notes:
- These variables are scoped: they can be defined on any selector and inherited.
- You can override them per element for different durations/easings.
- If a library expects these names, use the exact variable names to integrate with it.
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