Understanding ”-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;”
This snippet looks like custom CSS properties (CSS variables) intended to control a component’s animation. Below is a concise explanation, usage examples, and recommendations.
What it is
- -sd-animation: custom property naming a predefined animation (here, “sd-fadeIn”).
- –sd-duration: duration of the animation (0ms means no visible animation).
- –sd-easing: easing function controlling animation timing (“ease-in”).
How it works
These variables are likely read by a component or stylesheet that applies animation via the animation or transition shorthand, for example:
.element {animation-name: var(-sd-animation); animation-duration: var(–sd-duration, 300ms); animation-timing-function: var(–sd-easing, ease);}Example: enable a fade-in
- Define the keyframes:
@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }}- Apply variables to an element:
.card { –sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: cubic-bezier(.2,.8,.2,1); animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;}Notes and recommendations
- A duration of 0ms disables visible animation; use a positive value (e.g., 200–400ms) for perceivable motion.
- Use custom properties with consistent naming (prefer leading double-dash: –sd-animation) for standard CSS variable compatibility.
- Provide sensible fallbacks when reading variables: var(–sd-duration, 300ms).
- Keep accessibility in mind: respect users’ reduced-motion preferences with @media (prefers-reduced-motion: reduce) { animation-duration: 0ms; }.
Quick checklist
- Define keyframes for the named animation.
- Set nonzero duration for visible effects.
- Use easing to match the UI’s motion language.
- Add reduced-motion support.
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