These look like CSS custom properties (CSS variables) used by a design system or library to control an animation. Explanation:
- -sd-animation: sd-fadeIn;
- Purpose: selects a named animation (here, “sd-fadeIn”) that the component or library will apply.
- Usage: the library’s stylesheet likely maps that name to keyframes or animation presets.
- –sd-duration: 250ms;
- Purpose: sets the animation duration to 250 milliseconds.
- CSS type: time value; can be used in an animation shorthand or transition (e.g., animation-duration: var(–sd-duration);).
- –sd-easing: ease-in;
- Purpose: sets the animation timing function to ease-in.
- CSS type: timing-function; used like animation-timing-function: var(–sd-easing);.
Example usage in CSS (assuming the library reads these variables or you implement them):
css
.component {/* library-specific trigger / -sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;
/ hookup if you implement the behavior yourself / animation-name: var(–sd-animation); / requires the custom property to contain a keyframe name */ animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;}If the library uses named presets instead of raw keyframe names, set -sd-animation to the preset name and the library will apply the corresponding animation, duration, and easing automatically. To change behavior, adjust the variables or override them in a more specific selector.
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