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

  • –sd-animation: sd-fadeIn;

    • Likely selects the animation name or style (here, a fade-in animation defined elsewhere as “sd-fadeIn”).
  • –sd-duration: 0ms;

    • Sets the animation duration. 0ms means the animation will effectively be instantaneous (no visible transition).
  • –sd-easing: ease-in;

    • Sets the timing function controlling acceleration; “ease-in” starts slowly and then speeds up.

Usage notes:

  • These variables are read by a stylesheet or a component that applies the corresponding animation, e.g.:
    .element {animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);}
  • Ensure the animation keyframes (e.g., @keyframes sd-fadeIn) are defined.
  • p]:inline” data-streamdown=“list-item”>You can override these variables at any selector specificity (inline style, component root, theme).

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