stop-opacity

Defines the transparency (alpha) of a color stop in an SVG gradient. This allows you to create gradients that fade into transparency.

It is documented as part of the Scalable Vector Graphics specification.

/* Usage Example */
stop.fade-out {
  /* Makes this specific point in the SVG gradient 50% transparent */
  stop-opacity: 0.5;
}

/* Syntax */
stop-opacity: opacity;

/* Global values */
stop-opacity: inherit;
stop-opacity: initial;
stop-opacity: revert;
stop-opacity: revert-layer;
stop-opacity: unset;
Widely available Since 2020 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2020.

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