These look like CSS custom properties (variables) used to control a “sd-animation” system—likely a small design system or JS library that reads CSS vars to run animations. Breakdown:
- sd-animation: sd-fadeIn;
- Selects the animation preset named “sd-fadeIn” (a named keyframe or JS-handled preset).
- –sd-duration: 0ms;
- Duration of the animation: zero milliseconds (instant — no visible transition).
- –sd-easing: ease-in;
- Timing function: “ease-in” (slow start, faster end) if the animation has nonzero duration.
Implications and notes:
- With –sd-duration: 0ms the easing has no visual effect; the animation will effectively be instantaneous.
- If the system expects a numeric value in seconds, ensure units match (e.g., “0s” vs “0ms”) — most CSS accepts both.
- If this is consumed by JavaScript, confirm the library parses CSS variables; some require CSS custom properties on the element or :root.
- To disable animation reliably, some libraries check a separate flag (like –sd-disabled) instead of duration 0; test behavior across browsers.
- To create a visible fade-in: set –sd-duration to a positive value (e.g., 300ms) and keep –sd-easing as desired; ensure sd-fadeIn is defined (via @keyframes or JS preset).
If you want, I can:
- Show an example CSS snippet using these variables,
- Explain how to define an sd-fadeIn keyframes rule,
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