These are CSS custom properties (CSS variables) likely used by a UI framework or component to control an animation. Breakdown:

  • -sd-animation: sd-fadeIn;
    • Specifies the animation name or preset to apply (here a “fade in” preset called sd-fadeIn).
  • –sd-duration: 250ms;

    • Animation duration how long the animation runs (250 milliseconds).
  • –sd-easing: ease-in;

    • Timing function controlling the acceleration curve (starts slowly, speeds up).

How they’re typically used (example pattern):

  • A component or stylesheet reads these variables and maps the preset name to keyframes or applies them directly via the animation shorthand. Example usage in CSS:
.my-element {animation-name: var(–sd-animation);  animation-duration: var(–sd-duration, 250ms);  animation-timing-function: var(–sd-easing, ease);}

If sd-fadeIn is a preset, there should be corresponding keyframes, e.g.:

@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • Prefixing with a single hyphen (e.g., -sd-animation) is allowed but uncommon; standard custom properties require two leading hyphens (e.g., –sd-animation). If you intend to use them with var(), use the exact names defined.

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