stroke-opacity

Baseline Widely available

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

Thestroke-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 also has a CSS property counterpart:stroke-opacity. When both are specified, the CSS property takes priority.

You can use this attribute with the following SVG elements:

Example

html,body,svg {  height: 100%;}

html

<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" /></svg>

Usage notes

Value	`[0-1]` \|<percentage>
Default value	`1`
Animatable	Yes

It's important to know that the stroke partially covers the fill of a shape, so a stroke with an opacity different than1 will partially show the fill underneath. To avoid this effect, it is possible to apply a global opacity with theopacity attribute or to put the stroke behind the fill with thepaint-order attribute.