Those look like CSS custom properties (CSS variables) used to control an animation system. Here’s a concise breakdown:
- -sd-animation: sd-fadeIn;
- Purpose: Selects the animation to apply.
sd-fadeInis likely a named keyframe animation or a preset defined elsewhere in the stylesheet or JS. - Usage: Components/readers of these variables (CSS rules or scripts) will use the value to choose animation keyframes or apply conditional styles.
- Purpose: Selects the animation to apply.
- –sd-duration: 0ms;
- Purpose: Defines the animation duration.
0msmeans the animation runs instantly (no visible transition). - Effect: With 0ms, transitions or keyframe effects will not animate; they’d jump to the end state immediately.
- Purpose: Defines the animation duration.
- –sd-easing: ease-in;
- Purpose: Sets the timing function (easing) for the animation.
ease-inaccelerates from slow to fast. - Note: Easing has no visible effect if duration is
0ms.
- Purpose: Sets the timing function (easing) for the animation.
How they are typically used in CSS:
- Declared on an element or root:
.example {–sd-animation: sd-fadeIn; –sd-duration: 300ms; –sd-easing: ease-in;} - Consumed by animation rules (example patterns):
.animated { animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;} @keyframes sd-fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); }}
Practical notes:
- Change
–sd-durationfrom0msto a positive value (e.g.,200ms) to see the animation. - Ensure the named animation (
sd-fadeIn) is defined with@keyframesor handled by JavaScript. - Use
animation-fill-mode: bothorforwardsif you want the end state to persist after the animation.
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