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These look like custom CSS properties (CSS variables) likely used by a component or design system for controlling an animation. Explanation:

  • -sd-animation: sd-fadeIn;

    • Purpose: names the animation to run. Here it references a custom animation keyframe set called “sd-fadeIn”.
    • Usage: read by component CSS or JS to apply the appropriate animation rules.
  • –sd-duration: 250ms;

    • Purpose: sets the animation duration to 250 milliseconds.
    • Usage: typically used in an animation shorthand or transition property: animation-duration: var(–sd-duration);
  • –sd-easing: ease-in;

    • Purpose: sets the animation timing function (easing) to ease-in.
    • Usage: applied as animation-timing-function: var(–sd-easing);

Typical pattern to implement these variables in CSS:

:root {–sd-duration: 250ms;  –sd-easing: ease-in;  -sd-animation: sd-fadeIn;}
.my-element {  animation-name: var(-sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both; /* optional: keep end state */}
@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(4px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • The leading single dash in -sd-animation makes it a non-standard custom property name; custom properties normally start with – (two dashes). Using a single dash is nonstandard and may not be parsed as a CSS variable in all contexts — prefer –sd-animation unless the component specifically expects -sd-animation.
  • Use var(–sd-duration, 250ms) to provide fallbacks.
  • You can also control other animation aspects via variables: –sd-delay, –sd-iteration-count, –sd-fill-mode, etc.

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