Safe

Those look like CSS custom properties (CSS variables) used to configure an animation. Explanation:

  • –sd-animation: sd-fadeIn;

    • Sets the animation name or type to “sd-fadeIn” (a custom animation keyframe or an identifier used by a component/library).
  • –sd-duration: 250ms;

    • Duration of the animation: 250 milliseconds.
  • –sd-easing: ease-in;

    • Timing function controlling acceleration: “ease-in” (slow start, faster end).

Usage example (CSS):

css
.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);}@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(8px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • These variables are scoped: they can be defined on any selector and inherited.
  • You can override them per element for different durations/easings.
  • If a library expects these names, use the exact variable names to integrate with it.

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