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These are CSS custom properties (variables) and a custom property-like declaration for an animation shorthand. Here’s what each part means and how to use them:

  • –sd-animation: sd-fadeIn;

    • What it is: a custom property storing the animation name (here “sd-fadeIn”).
    • Use: reference it in the animation shorthand or animation-name to apply that animation.
  • –sd-duration: 250ms;

    • What it is: a custom property for the animation duration (250 milliseconds).
    • Use: plug into animation-duration or the animation shorthand.
  • –sd-easing: ease-in;

    • What it is: a custom property for the timing function (easing).
    • Use: reference it as animation-timing-function or in the animation shorthand.

Example usage (CSS):

css
:root {–sd-animation: sd-fadeIn;  –sd-duration: 250ms;  –sd-easing: ease-in;}
.my-element {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
/* Keyframes for sd-fadeIn */@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(8px); }  to   { opacity: 1; transform: translateY(0); }}

Notes and tips:

  • Using CSS variables lets you reuse and override animation settings easily (e.g., change duration on a parent).
  • You can combine into the shorthand: animation: var(–sd-animation) var(–sd-duration) var(–sd-easing) both;
  • Ensure the animation name matches the @keyframes rule.

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