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Those are CSS custom properties (CSS variables) and a shorthand-like declaration used to control a component animation. Breakdown:

  • -sd-animation: sd-fadeIn;
    • Likely a component-specific property telling the component which animation to use (here, a named keyframe or animation preset “sd-fadeIn”).
  • –sd-duration: 250ms;
    • Standard CSS custom property naming (double dash). Sets the animation duration to 250 milliseconds.
  • –sd-easing: ease-in;
    • Another CSS custom property specifying the timing function (easing) for the animation.

How they’re used (example):

css
.my-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);  animation-fill-mode: both;}@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • Custom properties starting with a single hyphen (like -sd-animation) are allowed but not standard — use double-dash (–) for broad compatibility and to conform to the CSS Custom Properties spec.
  • The component/library that defines these variables may read -sd-animation directly instead of using animation-name; check its docs.
  • You can override these variables on parent elements to change timing/easing globally.

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