These look like CSS custom properties (CSS variables) used to control an animation system. Explanation and how to use them:
- –sd-animation: sd-fadeIn;
- Sets the animation name or preset. Here it likely selects a predefined animation called “sd-fadeIn” (a fade-in effect).
- –sd-duration: 0ms;
- Controls the animation length.
0msmeans no visible animation (instant).
- Controls the animation length.
- –sd-easing: ease-in;
- Controls the timing function (acceleration curve).
ease-instarts slowly and speeds up.
- Controls the timing function (acceleration curve).
How they’re typically applied in CSS:
.element {/* define variables (can be on :root or a container) / –sd-animation: sd-fadeIn; –sd-duration: 300ms; –sd-easing: ease-in; / use variables in actual animation properties */ animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;}
Notes:
- If
–sd-durationis0ms, the element will appear immediately with no transition. - sd-fadeIn must be defined via
@keyframes sd-fadeIn { … }(or provided by a framework) for the name to work.
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