These look like custom CSS properties (CSS variables) likely used by a component or design system for controlling an animation. Explanation:
- -sd-animation: sd-fadeIn;
- Purpose: names the animation to run. Here it references a custom animation keyframe set called “sd-fadeIn”.
- Usage: read by component CSS or JS to apply the appropriate animation rules.
- –sd-duration: 250ms;
- Purpose: sets the animation duration to 250 milliseconds.
- Usage: typically used in an animation shorthand or transition property: animation-duration: var(–sd-duration);
- –sd-easing: ease-in;
- Purpose: sets the animation timing function (easing) to ease-in.
- Usage: applied as animation-timing-function: var(–sd-easing);
Typical pattern to implement these variables in CSS:
:root {–sd-duration: 250ms; –sd-easing: ease-in; -sd-animation: sd-fadeIn;}
.my-element { animation-name: var(-sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both; /* optional: keep end state */}
@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); }}Notes:
- The leading single dash in -sd-animation makes it a non-standard custom property name; custom properties normally start with – (two dashes). Using a single dash is nonstandard and may not be parsed as a CSS variable in all contexts — prefer –sd-animation unless the component specifically expects -sd-animation.
- Use var(–sd-duration, 250ms) to provide fallbacks.
- You can also control other animation aspects via variables: –sd-delay, –sd-iteration-count, –sd-fill-mode, etc.
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