The opacity attribute specifies the transparency of an object or of a group of objects, that is, the degree to which the background behind the element is overlaid.

Note: As a presentation attribute, opacity can be used as a CSS property. See the CSS opacity property for more information.

You can use this attribute with the following SVG elements:


<svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg">
    <linearGradient id="gradient" x1="0%" y1="0%" x2="0" y2="100%">
      <stop offset="0%" style="stop-color:skyblue;" />
      <stop offset="100%" style="stop-color:seagreen;" />
  <rect x="0" y="0" width="100%" height="100%" fill="url(#gradient)" />
  <circle cx="50" cy="50" r="40" fill="black" />
  <circle cx="150" cy="50" r="40" fill="black" opacity="0.3" />

Usage notes

Default value 1
Value <alpha-value>
Animatable Yes

The uniform opacity setting to be applied across an entire object, as a <number>. Any values outside the range 0.0 (fully transparent) to 1.0 (fully opaque) will be clamped to this range.


CSS Color Module Level 4
# transparency
Scalable Vector Graphics (SVG) 2
# ObjectAndGroupOpacityProperties

Browser compatibility

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See also