transition

A shorthand property that allows you to define the transition between two states of an element's properties, making the change smooth rather than instant.

It is documented as part of the CSS Transitions specification.

/* Usage Example */
.btn {
  transition: background-color 0.3s ease-in-out;
}
.btn:hover{
  background-color: var(--accent);
}

/* Global values */
transition: inherit;
transition: initial;
transition: revert;
transition: revert-layer;
transition: unset;
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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