opacity
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
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 also has a CSS property counterpart: opacity. When both are specified, the CSS property takes priority.
You can use this attribute with the following SVG elements:
<a><circle><ellipse><foreignObject><g><image><line><marker><path><polygon><polyline><rect><svg><switch><symbol><text><textPath><tspan><use>
Unlike fill-opacity, stroke-opacity, and stop-opacity, which are applied to individual operations and are rendered when the element is rendered, opacity is applied to whole objects or groups, and is more like a post-processing operation on the rendered image of the object or group. Therefore, when you have both opacity and the other opacity attributes in the same area, they will be overlaid on top of each other and cause the opacity to be multiplied.
Example
<svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<linearGradient id="gradient" x1="0%" y1="0%" x2="0" y2="100%">
<stop offset="0%" stop-color="skyblue" />
<stop offset="100%" stop-color="seagreen" />
</linearGradient>
</defs>
<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" />
</svg>
Usage notes
| Default value | 1 |
|---|---|
| Value | <alpha-value> |
| Animatable | Yes |
<alpha-value>-
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.
Specifications
| Specification |
|---|
| CSS Color Module Level 4 # propdef-opacity |
| Scalable Vector Graphics (SVG) 2 # ObjectAndGroupOpacityProperties |
Browser compatibility
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- Requires a vendor prefix or different name for use.
- Has more compatibility info.
See also
- CSS
opacityproperty fill-opacitystop-opacitystroke-opacity