These look like custom CSS properties and a utility (or shorthand) used for controlling a simple animation. Breakdown:
- -sd-animation: sd-fadeIn;
- Likely a vendor- or project-specific shorthand that references a predefined animation named “sd-fadeIn”. That animation name would be defined via @keyframes elsewhere (e.g., sd-fadeIn fades opacity and/or transforms).
- –sd-duration: 0ms;
- A CSS custom property (CSS variable) setting the animation duration to 0 milliseconds — effectively disabling visible animation (instant jump). Values can be overridden (e.g., 300ms, 0.5s).
- –sd-easing: ease-in;
- A CSS custom property for easing/timing-function. “ease-in” accelerates from slow to fast. Can be set to linear, ease-out, cubic-bezier(…), etc.
Typical usage pattern (project-specific names vary):
- @keyframes sd-fadeIn { from { opacity:0; transform: translateY(4px); } to { opacity:1; transform: translateY(0); } }
- .sd-animate { animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both; }
Notes:
- With –sd-duration: 0ms the element will jump to final state immediately; use >0 to see transition.
- Using CSS variables makes it easy to override per-element or via JS.
- Ensure the referenced animation name exists; otherwise nothing animates.
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