These look like custom CSS properties (CSS variables) used by a UI framework or component to control an animation. Explanation:
- -sd-animation: sd-fadeIn;
- What it is: sets which animation to apply (here a named animation “sd-fadeIn”).
- Effect: the element will use the keyframes or predefined animation rules associated with “sd-fadeIn” (typically a fade from transparent to opaque, possibly with slight movement).
- –sd-duration: 250ms;
- What it is: custom property specifying the animation length.
- Effect: the animation runs for 250 milliseconds.
- –sd-easing: ease-in;
- What it is: custom property specifying the timing function.
- Effect: the animation starts slowly and accelerates toward the end.
How they’re typically used in CSS:
- A component or stylesheet reads these variables and applies them to the element’s animation shorthand or to animation-duration / animation-timing-function.
Example pattern:
css
/component stylesheet */.element { animation-name: var(–sd-animation); animation-duration: var(–sd-duration, 300ms); animation-timing-function: var(–sd-easing, ease);}Notes and tips:
- Ensure the named animation (sd-fadeIn) is defined with @keyframes.
- Use the custom property names consistently; a leading single hyphen (-sd-animation) is unconventional for custom properties (which usually start with –). If the system expects -sd-animation specifically, keep it; otherwise prefer –sd-animation.
- You can override these per-element by setting the variables inline or on parent containers for cascaded control.
- For accessibility, avoid long/complex animations for motion-sensitive users; respect prefers-reduced-motion.
If you want, I can:
- Provide a complete example with @keyframes for sd-fadeIn,
- Show how to make these variables configurable per element,
- Or convert to a JS-controlled approach. Which would you like?
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