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-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;

The CSS fragment ”-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;” looks like a set of custom properties and a vendor-like shorthand used by a design system. Below is a concise explanation, usage examples, and guidance for making it practical.

What it is

• -sd-animation: a custom shorthand property (likely from a design system) that names a predefined animation (here, sd-fadeIn).
• –sd-duration: a CSS custom property controlling animation duration; set to 0ms (instant).
• –sd-easing: a CSS custom property for easing/timing function; ease-in here.

Together they indicate an element should use the sd-fadeIn animation but with zero duration and an ease-in curve — effectively no visible transition.

Practical intent

• Likely used to toggle animation behavior via variables without changing core animation definitions.
• Setting –sd-duration: 0ms is useful for disabling animations (e.g., for accessibility or initial render), while other contexts can override it to enable transitions.

Example CSS usage

:root {–sd-duration: 200ms;  –sd-easing: ease-out;}
/* Design-system animation definition /@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/ Utility that applies the animation using variables */.sd-animate {  animation-name: sd-fadeIn;  animation-duration: var(–sd-duration, 200ms);  animation-timing-function: var(–sd-easing, ease-out);  animation-fill-mode: both;}

Overriding to disable animation

<div class=“sd-animate” style=”–sd-duration: 0ms; –sd-easing: ease-in;”>  Instantly shown (no visible fade)</div>

Accessibility notes

• Respect user motion preferences: prefer prefers-reduced-motion to set –sd-duration: 0ms automatically.

@media (prefers-reduced-motion: reduce) {  :root { –sd-duration: 0ms; }}

Recommendations

• Use meaningful default durations (e.g., 150–300ms) and permit overrides via custom properties.
• Keep easing consistent across the design system (e.g., ease-out for entrances).
• Provide utilities for turning animations off globally for testing and accessibility.

If you want, I can convert this into a short tutorial, a copy-ready component, or variants (e.g., slide-in, scale) using the same variable approach.