These are CSS custom properties (variables) likely used by a design system or component library to control an element’s entrance animation. Briefly:
- -sd-animation: sd-fadeIn;
- Selects a named animation preset (here, “sd-fadeIn”). That preset maps to keyframes which typically animate opacity and possibly transform (e.g., translateY or scale) to create a fade-in effect.
- –sd-duration: 0ms;
- Sets the animation duration to 0 milliseconds, meaning the animation will effectively be instantaneous (no visible transition). Change to a positive value (e.g., 300ms) to see the fade.
- –sd-easing: ease-in;
- Sets the timing function for the animation to ease-in (slow start, faster end). Can be replaced with other easing values (linear, ease-out, cubic-bezier(…)).
Usage notes:
- These variables are intended to be consumed by CSS like animation-name: var(-sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing);
- Ensure the named animation (sd-fadeIn) is defined with @keyframes in the stylesheet or provided by the component library.
- With duration 0ms the easing value has no visible effect.
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