p]:inline” data-streamdown=”list-item”>Boost Conversions with CacheBooster: Real Performance Gains

Those look like CSS custom properties plus a utility-like shorthand for an animation. Brief breakdown:

• -sd-animation: sd-fadeIn;
  • Likely a custom (vendor/namespace) property used by a framework to select a predefined animation named “sd-fadeIn”.
• –sd-duration: 0ms;
  • A CSS custom property setting the animation duration to 0 milliseconds (instant; no visible animation).
• –sd-easing: ease-in;
  • A CSS custom property setting the timing function to ease-in (speeds up at the end).

Notes and practical effects:

• With duration 0ms, the easing value has no visible effect because there’s no time over which to interpolate.
• If you want a visible fade-in, set –sd-duration to a positive time (e.g., 300ms) and ensure the sd-fadeIn animation uses opacity and/or transform.
• Example (how sd-fadeIn might be implemented):
  @keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); }  to   { opacity: 1; transform: translateY(0); }}
  .element {  animation-name: sd-fadeIn;  animation-duration: var(–sd-duration, 300ms);  animation-timing-function: var(–sd-easing, ease);  animation-fill-mode: both;}