These look like custom CSS (or CSS-like) custom properties used to control a small animation system. Brief breakdown:
- –sd-animation: sd-fadeIn;
- Purpose: selects which animation to apply. Here the chosen animation is named “sd-fadeIn” (presumably defined elsewhere with @keyframes or in a stylesheet mapping names to keyframe sequences).
- –sd-duration: 0ms;
- Purpose: sets the animation duration. With 0ms the animation runs instantly (no visible transition). Typical values are like 200ms, 300ms, 1s, etc.
- –sd-easing: ease-in;
- Purpose: sets the timing function (easing) controlling animation acceleration. “ease-in” makes the animation start slowly and speed up.
Notes and implications:
- If duration is 0ms the easing has no visible effect; the animation is effectively disabled (instant jump).
- These are custom properties (CSS variables). To actually animate, they must be consumed by animation rules, e.g.:
css
.element {animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;} - Ensure the named animation (sd-fadeIn) is defined:
css
@keyframes sd-fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }} - To enable a visible fade-in, set a positive duration, e.g. –sd-duration: 300ms; or –sd-duration: 0.3s;
If you want, I can:
- give ready-to-use CSS for a fade-in using these variables, or
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