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These look like custom CSS custom properties and a shorthand utility for an animation. Brief breakdown and usage:

What they are

  • –sd-animation: sd-fadeIn; — a custom property naming which animation to apply (here a keyframe set named “sd-fadeIn”).
  • –sd-duration: 250ms; — duration of the animation.
  • –sd-easing: ease-in; — timing function (easing) for the animation.

Typical implementation pattern

  1. Define keyframes for the named animation:
css
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
  1. Use the custom properties in a rule (shorthand utility):
css
.element {  /* fallbacks if needed /  –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;}
  1. Variant: an authoring utility that switches animations via the property:
css
/ different animation option /:root { –sd-duration: 250ms; –sd-easing: ease-in; }
.fade-in { –sd-animation: sd-fadeIn; }.slide-left { –sd-animation: sd-slideLeft; }
/ components use the vars */.card {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);}

Notes and best practices

  • Provide sensible fallbacks for browsers that don’t support CSS variables.
  • Include animation-fill-mode (usually both or forwards) so the end state persists.
  • Use reduced-motion media query to respect user preferences:
css
@media (prefers-reduced-motion: reduce) {  .element { animation: none; }}

That’s the concise explanation and example usage.

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