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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