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Understanding the CSS Snippet: `-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;

This CSS snippet defines a custom animation using a custom property and shorthand for an animation name, duration, and easing. It appears to follow a naming convention (-sd- and sd-) likely used by a design system or a specific framework. Below is a concise explanation and practical usage.

What each part means

• -sd-animation: sd-fadeIn;
  Sets a custom property (prefixed with -sd-) to reference an animation named sd-fadeIn. This is not a standard CSS property; it’s a convention to store or signal which animation to use.
• –sd-duration: 0ms;
  A CSS custom property that sets the animation duration to 0 milliseconds. This effectively disables visible animation (instant change).
• –sd-easing: ease-in;
  A CSS custom property that defines the timing function for the animation.

How it might be used in CSS

Assuming the design system maps -sd-animation to a real animation, you can implement a pattern like:

:root {–sd-duration: 200ms;  –sd-easing: ease-out;}
/* Example animation keyframes /@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/ Component base that reads the custom properties /.component {  animation-name: var(–sd-animation-name, sd-fadeIn);  animation-duration: var(–sd-duration, 200ms);  animation-timing-function: var(–sd-easing, ease-out);  animation-fill-mode: both;}
/ Bridge between the ‘-sd-animation’ convention and standard property */[data-sd-animation=“sd-fadeIn”] {  –sd-animation-name: sd-fadeIn;}

Practical notes

• With –sd-duration: 0ms, the animation completes instantly; use a positive duration (e.g., 200ms) to see the fade-in effect.
• The -sd- prefix implies internal or private API; prefer documented tokens from your framework.
• Use animation-fill-mode: both or forwards to keep the end state after the animation.

Example HTML

<div data-sd-animation=“sd-fadeIn” style=”–sd-duration:200ms; –sd-easing:ease-in;”>  Fade-in content</div>

This sets up a fade-in animation using the snippet’s conventions while replacing the 0ms duration with a visible value.