Article: ”-sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;”
What this CSS snippet does
This is a set of custom CSS properties (custom properties often called CSS variables) intended to control a simple animation. Interpreted together they:
- Define an animation name: -sd-animation: sd-fadeIn;
- Set the animation duration: –sd-duration: 250ms;
- Set the animation timing function: –sd-easing: ease-in;
Practical use
Apply these variables on an element and reference them from actual animation rules. Example usage pattern:
/Define the fade-in keyframes /@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }}
/ Component or utility that uses the custom properties */.component { animation-name: var(–sd-animation, sd-fadeIn); animation-duration: var(–sd-duration, 250ms); animation-timing-function: var(–sd-easing, ease-in); animation-fill-mode: both;}Then in HTML/CSS you can set the variables (note: original snippet uses a hyphenated custom property name for animation—normalize to double-hyphen form if you control both declaration and usage):
.card { –sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;}Tips and considerations
- Use consistent custom property names: custom properties must start with two hyphens (e.g., –sd-animation). The snippet’s ”-sd-animation” is nonstandard unless intentionally mapped by a preprocessor.
- Provide sensible fallbacks when using var(), as shown above.
- For accessibility, avoid motion for users who prefer reduced motion:
@media (prefers-reduced-motion: reduce) { .component { animation: none; }}- Combine with animation-delay or staggered timings for sequential reveals.
Example: HTML usage
<div class=“card component”> Hello — I fade in!</div>Apply the CSS above; the element will animate with a 250ms ease-in fade and slight upward motion.
Summary
The snippet specifies a fade-in animation, its duration, and easing via custom properties. Use standard double-hyphen property names, provide fallbacks, respect reduced-motion preferences, and reference the variables in animation rules to achieve reusable, themeable UI animations.
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