-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;
This article explains a CSS-like custom property snippet often seen in design systems and animation frameworks, what each part means, and how to use it effectively in web projects.
What the snippet represents
- -sd-animation: likely a custom property name used to declare a shorthand for an animation preset or class (here named
sd-fadeIn). - –sd-duration: sets the animation length;
0msmeans the animation will complete instantly. - –sd-easing: defines the timing function;
ease-instarts slowly and accelerates.
Typical use cases
- Design systems: provide consistent animation presets across components.
- Component libraries: allow per-component overrides of duration and easing.
- A/B testing or accessibility modes: set duration to
0msto disable animations.
How it might be implemented in CSS
A design system could map these custom properties to real animation rules:
css
:root {–sd-animation: sd-fadeIn; –sd-duration: 300ms; –sd-easing: ease-in;}
/* Example animation keyframes /@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); }}
/ Utility that applies the animation */.anim { animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;}If –sd-duration is set to 0ms, the animation will appear immediate—useful for users who prefer reduced motion.
Accessibility considerations
- Honor user preferences like
prefers-reduced-motion; set duration to0mswhen reduced motion is detected. - Avoid animations that trigger motion sickness; fade and subtle transforms are usually safer.
Practical tips
- Provide sensible defaults in your design system root variables.
- Allow component-level overrides for timing and easing.
- Use descriptive names for presets (e.g.,
sd-fadeIn-slow) and document them.
Conclusion
This snippet shows a flexible pattern for controlling animations via custom properties. Use it to centralize animation behavior, respect accessibility, and let components opt into or out of animations by changing simple variables.
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