@keyframes

Defines the steps of a CSS animation. You specify exactly which styles should change at specific points (0% to 100%) during the animation sequence.

It is documented as part of the CSS Animations specification.

/* Usage Example */
@keyframes fadeIn {
from{ opacity: 0; transform: translateY(10px); }
to{ opacity: 1; transform: translateY(0); }
}
.fade-in-element{
  animation: fadeIn 0.5s ease-out forwards;
}
Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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