These look like custom CSS properties and a shorthand class name likely used by a design system or UI framework to control appearance-animation. Short summary:
- -sd-animation: sd-fadeIn;
- A custom (nonstandard) CSS property or a class token naming the animation to apply. “sd-fadeIn” is likely a keyframe animation that fades element opacity from 0 → 1 (and possibly moves it slightly).
- –sd-duration: 0ms;
- A CSS custom property (standard syntax) setting the animation duration. 0ms means the animation will complete instantly (no visible transition).
- –sd-easing: ease-in;
- A CSS custom property defining timing function for the animation. “ease-in” makes the animation start slowly and speed up.
Behavior and interactions:
- If the animation name is set but duration is 0ms, the element will instantly appear with no perceptible fade; easing has no visible effect.
- If a different positive duration (e.g., 300ms) is used, sd-fadeIn would produce a fade-in whose progression follows ease-in.
- These vars need to be consumed by CSS rules, for example:
.sd-animated {animation-name: var(–sd-animation, none); animation-duration: var(–sd-duration, 300ms); animation-timing-function: var(–sd-easing, ease);} - Some frameworks use a prefixed property (-sd-animation) as a hook for JS or tooling; ensure it’s read by your CSS/JS.
Recommendations:
- Change –sd-duration to a positive value (e.g., 200–400ms) for visible animation.
- Use descriptive easing (ease-out or cubic-bezier) depending on feel needed.
- Confirm that the animation keyframes (sd-fadeIn) exist:
@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); }} - Prefer standard custom property names ( –sd-animation ) over vendor-prefixed ones unless the codebase requires the prefixed form.
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