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

This article explains what the CSS-like custom properties in the title mean, how they’re used, and when to apply them. I’ll assume these are CSS custom properties (CSS variables) used by a component or design system to control animations.

What these properties represent

  • -sd-animation: sd-fadeIn;
    Sets the named animation or animation preset the component should run. In a design system, sd-fadeIn likely references a predefined keyframe sequence that fades an element from transparent to opaque.

  • –sd-duration: 0ms;
    Controls how long the animation runs. 0ms means the animation duration is zero — effectively instantaneous. This is useful when you want to disable animation while keeping the same CSS contract.

  • –sd-easing: ease-in;
    Defines the timing function for the animation’s progression. ease-in causes the animation to start slowly and speed up toward the end.

Typical implementation patterns

  1. Define keyframes and a mapping from the custom property to actual animation rules:
css
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/* Fallback default variables /:root {  –sd-animation: sd-fadeIn;  –sd-duration: 200ms;  –sd-easing: ease-out;}
/ Component uses the variables */.component {  animation-name: var(–sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
  1. Inline or per-instance overrides:
html
<div class=“component” style=”–sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;”>  Instant reveal content</div>

Use cases

  • Disable animation for accessibility or testing: Setting –sd-duration: 0ms turns off the visual transition while preserving markup and behavior.
  • Per-component customization: Different elements can share the same CSS but vary animations via these variables.
  • Design system consistency: Using semantic animation names (like sd-fadeIn) keeps animations consistent and replaceable.

Accessibility considerations

  • Respect user preferences: prefer prefers-reduced-motion to set –sd-duration: 0ms when users request reduced motion.
css
@media (prefers-reduced-motion: reduce) {  :root { –sd-duration: 0ms; }}
  • Instantaneous changes can be jarring; use 0ms only when necessary (e.g., testing or explicit user choice).

Troubleshooting

  • If nothing animates, ensure the named keyframes exist and animation-name is correctly assigned from the custom property.
  • Zero duration yields no visual interpolation—confirm that’s intended.
  • Ensure custom property names match (note leading hyphen vs double-hyphen).

Quick checklist before using these values

  • Is zero duration intentional (accessibility/testing)? If not, set a nonzero duration.
  • Does sd-fadeIn keyframe exist and include properties you expect (opacity, transform)?
  • Have you handled reduced-motion preferences?

Example: toggle with CSS variables and JavaScript

js
// Toggle animations on/offconst el = document.querySelector(’.component’);function setAnimations(enabled) {  el.style.setProperty(’–sd-duration’, enabled ? ‘200ms’ : ‘0ms’);}

Conclusion: The trio -sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in; provides a flexible, design-system-friendly way to control animation behavior per component, with 0ms effectively disabling motion while preserving structure. Use it thoughtfully alongside accessibility settings.

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