”-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;”
This article explains what the CSS-like snippet ”-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;” likely represents, why it might be used, and how to apply and adjust it effectively.
What the snippet means
- -sd-animation: sd-fadeIn;
Likely a custom or vendor-prefixed property that assigns a named animation (here “sd-fadeIn”) to an element. - –sd-duration: 0ms;
A CSS custom property (variable) setting the animation duration to 0 milliseconds — effectively disabling visible animation unless overridden. - –sd-easing: ease-in;
A CSS custom property defining the timing function for the animation; “ease-in” accelerates from slow to fast.
Why someone would use this
- To declaratively apply a named fade-in animation while allowing centralized control via CSS variables.
- Setting duration to 0ms can be used as a default to disable animations for instant appearance, with the option to enable them by changing the variable in specific contexts (e.g., on larger screens or when reduced-motion is not preferred).
Practical implementation
Example CSS using these properties:
css
/Define the keyframes for sd-fadeIn /@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); }}
/ Base animation rule reading variables /.element { animation-name: var(–sd-animation-name, sd-fadeIn); animation-duration: var(–sd-duration, 300ms); animation-timing-function: var(–sd-easing, ease); animation-fill-mode: both;}
/ Map the shorthand custom property to actual variables if needed /:root { –sd-animation-name: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;}
/ Enable animation in contexts where desired */@media (prefers-reduced-motion: no-preference) { .with-animate { –sd-duration: 300ms; }}Notes:
- The snippet as given mixes a custom property name (-sd-animation) and CSS variables; browsers ignore unknown properties, so use variables (–) and standard animation properties to ensure behavior.
- Use prefers-reduced-motion to respect accessibility and change –sd-duration to 0ms when users prefer reduced motion.
- To toggle animations dynamically, update the custom properties on a parent element or via JavaScript:
js
document.documentElement.style.setProperty(’–sd-duration’, ‘400ms’);Common gotchas
- Unknown properties prefixed with a dash (e.g., -sd-animation) won’t affect rendering unless processed by tooling or JavaScript — prefer standard properties or use variables.
- Setting duration to 0ms results in no visible animation.
- Ensure variable fallbacks exist to prevent unexpected behavior in older browsers.
Recommendation
Use CSS variables to centralize animation control, respect reduced-motion preferences, and avoid relying on nonstandard property names unless part of a specific framework that consumes them.
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