The stroke-opacity attribute is a presentation attribute defining the opacity of the paint server (color, gradient, pattern, etc.) applied to the stroke of a shape.
Note: As a presentation attribute stroke-opacity can be used as a CSS property.
You can use this attribute with the following SVG elements:
<svg viewBox="0 0 40 10" xmlns="http://www.w3.org/2000/svg">
<!-- Default stroke opacity: 1 -->
<circle cx="5" cy="5" r="4" stroke="green" />
<!-- Stroke opacity as a number -->
<circle cx="15" cy="5" r="4" stroke="green" stroke-opacity="0.7" />
<!-- Stroke opacity as a percentage -->
<circle cx="25" cy="5" r="4" stroke="green" stroke-opacity="50%" />
<!-- Stroke opacity as a CSS property -->
<circle cx="35" cy="5" r="4" stroke="green" style="stroke-opacity: .3;" />
</svg>
| Value | [0-1] | <percentage> |
|---|---|
| Default value | 1 |
| Animatable | Yes |
Note: SVG2 introduces percentage values for stroke-opacity, however, it is not widely supported yet (See Browser compatibility below) as a consequence, it is best practices to set opacity with a value in the range [0-1].
It's important to know that the stroke partially covers the fill of a shape, so a stroke with an opacity different than 1 will partially show the fill underneath. To avoid this effect, it is possible to apply a global opacity with the opacity attribute or to put the stroke behind the fill with the paint-order attribute.
| Specification |
|---|
| Scalable Vector Graphics (SVG) 2 # StrokeOpacity |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
stroke-opacity |
No | No | No | No | No | No | No | No | No | No | No | No |
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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-opacity