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Understanding CSS Custom Properties: ”-sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;”

Custom properties (CSS variables) let you store values once and reuse them across your stylesheet. The snippet –sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in; is an example of using custom properties to parameterize an animation system. Below is a concise guide explaining what each part does, why this pattern is useful, and how to implement and extend it.

What each property means

  • –sd-animation: sd-fadeIn;
    Holds the name of the animation to apply. Using a variable here allows switching between animation presets (e.g., sd-slideUp, sd-scaleIn) without changing multiple CSS rules.

  • –sd-duration: 250ms;
    Sets the animation duration. Using a variable makes it easy to tune timing across many components consistently.

  • –sd-easing: ease-in;
    Defines the timing function for the animation, controlling acceleration and deceleration.

Why use this pattern

  • Reusability: Centralize animation configuration to keep consistent motion across components.
  • Theming: Swap variable values in different themes (dark/light, compact/accessible) to change motion behavior globally.
  • Maintainability: Update duration/easing in one place rather than editing multiple animation declarations.
  • Declarative component styling: Components declare desired animation via variables and a shared animation utility applies them.

Basic implementation

CSS:

css
:root {–sd-duration: 250ms;  –sd-easing: ease-in;}
/* Define keyframes for sd-fadeIn /@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/ Utility that reads variables to apply animation */.sd-animated {  animation-name: var(–sd-animation, none);  animation-duration: var(–sd-duration, 250ms);  animation-timing-function: var(–sd-easing, ease-in);  animation-fill-mode: both;}

HTML usage:

html
<div class=“sd-animated” style=”–sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;”>  Fade-in content</div>

Advanced tips

  • Fallbacks: Provide sensible defaults in property values with the var() fallback syntax.
  • Accessibility: Respect user motion preferences — disable or simplify animations for users who prefer reduced motion.
css
@media (prefers-reduced-motion: reduce) {  .sd-animated { animation: none !important; transition: none !important; }}
  • Composition: Combine multiple animations by setting –sd-animation to a comma-separated list and corresponding duration/easing lists.
  • JavaScript control: Toggle or update custom properties at runtime with element.style.setProperty to dynamically change animations per interaction.

Example: Theme switch

css
.theme-fast { –sd-duration: 120ms; –sd-easing: cubic-bezier(.2,.9,.2,1); }.theme-slow { –sd-duration: 400ms; –sd-easing: ease-out; }

Conclusion

Using CSS custom properties like –sd-animation, –sd-duration, and –sd-easing makes animation systems flexible, themeable, and maintainable. They separate motion intent from implementation, enabling consistent, accessible UI motion across a project.

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