Recovery:

Those look like CSS custom properties (CSS variables) used by a styling system to control a short fade-in animation. Brief explanation:

  • –sd-animation: sd-fadeIn;
    • Names the animation to run (presumably a keyframes animation called “sd-fadeIn”).
  • –sd-duration: 250ms;
    • Sets the animation duration to 250 milliseconds.
  • –sd-easing: ease-in;
    • Sets the timing function to “ease-in” (accelerates toward the end).

How they’re typically used (example CSS pattern):

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

Notes:

  • These are just variable names; the actual effect depends on the defined @keyframes for sd-fadeIn.
  • You can override the variables on child elements or in different states (hover, prefers-reduced-motion).
  • For accessibility, respect prefers-reduced-motion: reduce or disable animations for users who prefer less motion. Example:
css
@media (prefers-reduced-motion: reduce) {  .element { animation: none; transition: none; }}

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