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Those look like custom CSS properties and a utility class controlling a simple fade-in animation. Summary:

• -sd-animation: sd-fadeIn; — a custom property (or shorthand) indicating the animation name to apply.
• –sd-duration: 250ms; — custom property specifying the animation duration (250 milliseconds).
• –sd-easing: ease-in; — custom property specifying the timing function (acceleration at end).

Example usage (how these tie together):

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

• Apply via a class that reads the custom properties:
  .sd-animated {  animation-name: var(-sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}

Notes:

• Use consistent custom property names: CSS variables must start with two dashes (e.g., –sd-animation). A single leading dash (-sd-animation) is invalid as a custom property.
• Fallbacks: provide defaults with var(–x, fallback).
• @media (prefers-reduced-motion: reduce) {  .sd-animated { animation: none; transition: none; }}