stroke-opacity

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 also has a CSS property counterpart: {{cssxref("stroke-opacity")}}. When both are specified, the CSS property takes priority.

You can use this attribute with the following SVG elements:

{{SVGElement('circle')}}
{{SVGElement('ellipse')}}
{{SVGElement('path')}}
{{SVGElement('line')}}
{{SVGElement('polygon')}}
{{SVGElement('polyline')}}
{{SVGElement('rect')}}
{{SVGElement('text')}}
{{SVGElement('textPath')}}
{{SVGElement('tspan')}}

Example

css

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" style="stroke-opacity: .3;" />
</svg>

Usage notes

<table class="properties"> <tbody> <tr> <th scope="row">Value</th> <td> <code>[0-1]</code> | <strong ><a href="/en-US/docs/Web/SVG/Guides/Content_type#paint" ><percentage></a ></strong > </td> </tr> <tr> <th scope="row">Default value</th> <td><code>1</code></td> </tr> <tr> <th scope="row">Animatable</th> <td>Yes</td> </tr> </tbody> </table>

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 {{SVGAttr('opacity')}} attribute or to put the stroke behind the fill with the {{SVGAttr('paint-order')}} attribute.

Example

Usage notes

Specifications

Browser compatibility

See also