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Those look like CSS custom properties (CSS variables) used to control an animation. Brief explanation of each:

  • -sd-animation: sd-fadeIn;
    • Likely stores the animation name (here “sd-fadeIn”)—used by animation-related rules to pick which keyframes to run.
  • –sd-duration: 0ms;

    • Controls how long the animation runs. 0ms means no visible animation (instant).
  • –sd-easing: ease-in;

    • Sets the timing function (acceleration curve). “ease-in” makes the animation start slowly and speed up.

How they’re typically used (example):

.element {–sd-animation: sd-fadeIn;  –sd-duration: 300ms;  –sd-easing: ease-in;  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(8px); }  to   { opacity: 1; transform: translateY(0); }}

Notes:

  • p]:inline” data-streamdown=“list-item”>Custom properties are inherited and can be overridden per element for flexible control.

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