These are CSS custom properties (CSS variables) typically used to control an animation. Breakdown:
- -sd-animation: sd-fadeIn;
- Names the animation to apply (likely a keyframe animation called “sd-fadeIn”).
- –sd-duration: 250ms;
- Sets the animation duration to 250 milliseconds.
- –sd-easing: ease-in;
- Sets the timing function to “ease-in” (starts slow, then accelerates).
Usage example (assumes a CSS variable-based animation system):
.element {animation-name: var(-sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing);}@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }}
Notes:
- Variable names must match (leading hyphen vs double hyphen). Standard custom properties use two hyphens (–name). Single-leading-hyphen (-sd-animation) is unconventional and may not be supported as a custom property in browsers unless used intentionally by a framework; prefer –sd-animation.
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