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Understanding -sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;

This article explains the meaning, use cases, and implementation patterns for the custom CSS properties and shorthand shown: -sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;. It covers how these variables can be defined and consumed, accessibility considerations, and practical examples for web components and utility classes.

What these declarations mean

  • -sd-animation: sd-fadeIn;
    A custom property (likely vendor- or framework-prefixed) that names a predefined animation variant called sd-fadeIn. The prefix -sd- suggests a scoped or design-system-specific variable.
  • –sd-duration: 250ms;
    A CSS custom property that defines the duration of the animation as 250 milliseconds.
  • –sd-easing: ease-in;
    A CSS custom property that defines the timing function (easing) for the animation.

Together they configure an element to run the sd-fadeIn animation for 250ms with an ease-in timing curve.

Typical implementation patterns

  1. Define the keyframes and default variables at a global or component level:
css
:root {–sd-duration: 300ms; /* default /  –sd-easing: ease;  -sd-animation: none;}
@keyframes sd-fadeIn {  from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
/ Utility to apply a named animation using the variables */.sd-animated {  animation-name: var(-sd-animation);  animation-duration: var(–sd-duration);  animation-timing-function: var(–sd-easing);  animation-fill-mode: both;}
  1. Use scoped or component styles to override defaults:
css
.my-component {  -sd-animation: sd-fadeIn;  –sd-duration: 250ms;  –sd-easing: ease-in;}
  1. Apply in HTML:
html
<div class=“sd-animated my-component”>  Content that fades in</div>

Practical variations

  • Faster fade:
    • –sd-duration: 150ms;
  • Slower, bouncy entrance:
    • –sd-duration: 450ms; –sd-easing: cubic-bezier(.2,.9,.3,1);
  • Slide + fade:
    • Adjust keyframes to include translateX or translateY.

Accessibility considerations

  • Respect prefers-reduced-motion: disable or shorten animations when users request reduced motion.
css
@media (prefers-reduced-motion: reduce) {  .sd-animated { animation: none; transition: none; }}
  • Ensure animations don’t cause focus or reading disruptions; avoid excessive movement.

Integration tips

  • Use meaningful variable names and document them in your design system.
  • Allow component authors to override duration and easing via CSS variables for flexibility.
  • For JavaScript-driven components, toggle the class that applies animation variables to trigger transitions predictably.

Example: Toggle-triggered animation with JS

html
<button id=“show”>Show</button><div id=“panel” class=“sd-animated” aria-hidden=“true”>Hello</div>
js
document.getElementById(‘show’).addEventListener(‘click’, () => {  const p = document.getElementById(‘panel’);  p.style.setProperty(’-sd-animation’, ‘sd-fadeIn’);  p.style.setProperty(’–sd-duration’, ‘250ms’);  p.style.setProperty(’–sd-easing’, ‘ease-in’);  p.removeAttribute(‘aria-hidden’);});

Conclusion

The trio -sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in; is a compact, flexible way to configure component animations using CSS custom properties. Define clear keyframes, respect user preferences, and expose sensible defaults and overrides to make animations consistent across your UI.

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