Those look like CSS custom properties (CSS variables) used by a styling system to control a short fade-in animation. Brief explanation:
- –sd-animation: sd-fadeIn;
- Names the animation to run (presumably a keyframes animation called “sd-fadeIn”).
- –sd-duration: 250ms;
- Sets the animation duration to 250 milliseconds.
- –sd-easing: ease-in;
- Sets the timing function to “ease-in” (accelerates toward the end).
How they’re typically used (example CSS pattern):
css
.element {/* set variables / –sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;
/ apply animation using the variables / animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both; / keep end state */}@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); }}
Notes:
- These are just variable names; the actual effect depends on the defined @keyframes for sd-fadeIn.
- You can override the variables on child elements or in different states (hover, prefers-reduced-motion).
- For accessibility, respect prefers-reduced-motion: reduce or disable animations for users who prefer less motion. Example:
css
@media (prefers-reduced-motion: reduce) { .element { animation: none; transition: none; }}
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