Understanding ”-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;”
The CSS-like declaration shown mixes a custom property and a custom shorthand for animation behavior. This article explains what each part means, how it might be used, and how to convert it into standard CSS animations that browsers understand.
What the tokens represent
- -sd-animation: sd-fadeIn;
- Likely a project-specific (or framework-specific) custom property or shorthand indicating a named animation preset “sd-fadeIn”.
- The leading hyphen suggests a nonstandard or vendor-like namespace.
- –sd-duration: 0ms;
- A CSS custom property (CSS variable) that sets the duration for the animation. Value here is 0 milliseconds, meaning no visible animation unless overridden.
- –sd-easing: ease-in;
- Another CSS custom property defining the timing function (easing) for the animation.
Intent and typical usage
This pattern is often used in component libraries or design systems to:
- Define named animations via a short token (sd-fadeIn).
- Allow per-component overrides of duration and easing using CSS variables.
- Keep animation definitions centralized while enabling flexible customization.
A common workflow:
- Define keyframes and a mapping from the named token to standard animation properties.
- Use the custom properties on components to adjust timing/easing without editing keyframes.
Example: Implementing sd-fadeIn in standard CSS
Below is how you might implement the intent in plain CSS so browsers will animate elements:
css
/Define the keyframes */@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0);
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