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.

You can use this attribute with the following SVG elements:

• <altGlyph>
• <circle>
• <ellipse>
• <path>
• <line>
• <polygon>
• <polyline>
• <rect>
• <text>
• <textPath>
• <tref>
• <tspan>

Example

<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

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.

Browser compatibility

Specifications