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Understanding the CSS snippet: -sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;
This CSS fragment appears to use custom properties and a vendor-prefixed or framework-specific animation property to control an element’s animation behavior.
What each part means
- -sd-animation: sd-fadeIn;
Likely a framework- or library-specific property (the -sd- prefix indicates a nonstandard or scoped property). It sets the animation name or type tosd-fadeIn, which suggests a fade-in effect defined elsewhere in the stylesheet or by the component library. - –sd-duration: 0ms;
A CSS custom property (variable) named–sd-durationwith value0ms. When referenced by the animation implementation, this determines how long the animation runs. A value of0mseffectively disables visible animation (instant change). - –sd-easing: ease-in;
Another custom property specifying the animation timing function.ease-inmakes the animation start slowly and speed up toward the end. With a duration of 0ms, easing has no visible effect.
Typical usage
A component or stylesheet may define the animation using these variables, for example:
/Example definition elsewhere in the framework /@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); }}
.my-element { animation-name: var(–sd-animation-name, sd-fadeIn); animation-duration: var(–sd-duration, 250ms); animation-timing-function: var(–sd-easing, ease); animation-fill-mode: both;}In this pattern, the library might map -sd-animation: sd-fadeIn; to set the animation name or toggle preset animations, while –sd-duration and –sd-easing allow per-instance overrides.
Why duration is 0ms here
Setting –sd-duration: 0ms can be intentional:
- Disable animation for users who prefer reduced motion.
- Make an element appear instantly while keeping the same markup and variables for easy toggling.
- Provide a default that scripts can update dynamically to enable animations later.
How to enable a visible fade-in
Change the duration to a positive value and ensure the animation name matches a defined keyframes rule:
/ Inline override */element { -sd-animation: sd-fadeIn; –sd-duration: 300ms; –sd-easing: ease-out;}Accessibility note
Respect users’ motion preferences (prefers-reduced-motion). Use media queries to set duration to 0ms for users who request reduced motion:
@media (prefers-reduced-motion: reduce) { :root { –sd-duration: 0ms; }}Summary
The snippet configures a fade-in animation via a library-specific property and two custom properties controlling duration and easing. With a 0ms duration, the effect is instant; changing the duration enables a visible animation. Use prefers-reduced-motion
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