These look like CSS custom properties (CSS variables) used to control an animation. Breakdown:
- -sd-animation: sd-fadeIn;
- Likely names the animation to run (e.g., a keyframes animation named “sd-fadeIn” or a predefined animation identifier used by a component library).
- –sd-duration: 0ms;
- Sets the animation duration to 0 milliseconds (effectively disabling any visible animation; the animated property jumps instantly to its end state).
- –sd-easing: ease-in;
- Defines the animation timing function; “ease-in” starts slow and speeds up toward the end.
How they work together
- A component or stylesheet reads these custom properties and applies them to an animation rule, e.g.:
animation-name: var(-sd-animation);animation-duration: var(–sd-duration);animation-timing-function: var(–sd-easing); - With duration 0ms, the easing has no visible effect because there’s no transition time.
Notes and tips
- Use consistent naming: custom properties are case-sensitive and often prefixed (here with -sd or –sd) to avoid collisions.
- If you want a visible fade-in, set –sd-duration to a positive value like 300ms and ensure the animation keyframes (sd-fadeIn) animate opacity or transform.
- Example enabling a fade:
–sd-duration: 300ms;-sd-animation: sd-fadeIn; /CSS using them */animation-name: var(-sd-animation);animation-duration: var(–sd-duration);animation-timing-function: var(–sd-easing);animation-fill-mode: both;
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