This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.
The stop-opacity attribute defines the opacity of a given color gradient stop.
The opacity value used for the gradient calculation is the product of the value of stop-opacity and the opacity of the value of the stop-color attribute. For stop-color values that don't include explicit opacity information, the opacity is treated as 1.
Note: As a presentation attribute, stop-opacity also has a CSS property counterpart: stop-opacity. When both are specified, the CSS property takes priority.
You can use this attribute with the following SVG elements:
| Value | <opacity-value> |
|---|---|
| Default value | 1 |
| Animatable | Yes |
<opacity-value>This value is either a <number> between 0 and 1 or a <percentage> value specifying the opacity of the color gradient stop.
| Specification |
|---|
| Scalable Vector Graphics (SVG) 2> # StopOpacityProperty> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
stop-opacity |
1 | 12 | 1.5 | 9 | 3 | 18 | 4 | 10.1 | 143–11 | 1.0 | 3 | 143–11 |
stop-opacity propertystop-coloropacityfill-opacitystroke-opacity
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https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Attribute/stop-opacity