These are CSS custom properties (CSS variables) likely used by a UI framework or component to control an animation. Breakdown:
- -sd-animation: sd-fadeIn;
- Specifies the animation name or preset to apply (here a “fade in” preset called sd-fadeIn).
- –sd-duration: 250ms;
- Animation duration — how long the animation runs (250 milliseconds).
- –sd-easing: ease-in;
- Timing function controlling the acceleration curve (starts slowly, speeds up).
How they’re typically used (example pattern):
- A component or stylesheet reads these variables and maps the preset name to keyframes or applies them directly via the animation shorthand. Example usage in CSS:
.my-element {animation-name: var(–sd-animation); animation-duration: var(–sd-duration, 250ms); animation-timing-function: var(–sd-easing, ease);}
If sd-fadeIn is a preset, there should be corresponding keyframes, e.g.:
@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }}
Notes:
- Prefixing with a single hyphen (e.g., -sd-animation) is allowed but uncommon; standard custom properties require two leading hyphens (e.g., –sd-animation). If you intend to use them with var(), use the exact names defined.
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