radial-gradient

The CSS radial-gradient() function creates an <image> which represents a gradient of colors radiating from an origin. The result of this function is an object of the CSS <gradient> data type. Radial gradients are defined by their origin and the angle, orientation, and type, a circle or an ellipse of the spreading shape.

Like any other gradient, a CSS radial gradient is not a CSS <color> but an image with no intrinsic dimensions, i. e. it has no natural or preferred size, nor ratio. Its concrete size will match the one of the element it applies to.

The radial-gradient function does not allow repeating gradients. For such a functionality, use the CSS repeating-radial-gradient function.

This is an experimental feature
Because this feature is still in development in some browsers, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental feature is subject to change in future version of browsers as the spec changes.

Syntax

radial-gradient( [<position> || <angle>,]? [<shape> || <size>,]? <stop>, <stop>[, <stop>]* )

Values

<position>
A position, interpreted in the same way as background-position or transform-origin . If omitted, the default is center.
<angle>
An angle establishing the gradient line, which extends from the starting point at this angle; this is 0deg by default.
<shape>
The gradient's shape. This is one of circle (meaning that the gradient's shape is a circle with constant radius) or ellipse (meaning that the shape is an axis-aligned ellipse). The default value is ellipse.
<size>
The size of the gradient. This is one of the Size constants listed below.
<stop>
This value is comprised of a <color> value, followed by an optional stop position (either a percentage between 0% and 100% or a <length> along the gradient axis).
Rendering of color-stops in CSS gradients follows the same rules as color-stops in SVG gradients.

Size constants

Constant Description
closest-side
The gradient's shape meets the side of the box closest to its center (for circles) or meets both the vertical and horizontal sides closest to the center (for ellipses).
closest-corner The gradient's shape is sized so it exactly meets the closest corner of the box from its center.
farthest-side Similar to closest-side, except the shape is sized to meet the side of the box farthest from its center (or vertical and horizontal sides).
farthest-corner
The gradient's shape is sized so it exactly meets the farthest corner of the box from its center.
contain
A synonym for closest-side.
cover
A synonym for farthest-corner.

Usage

Radial gradients also run along an axis. At each end point of the axis, a radius is specified. This can be imagined as creating two "circles", where for each circle the center is specified by the point and the radius is specified by the radius length. The gradient runs outwards from the circumference of the inner circle to the circumference of the outer circle.

background-image:    -moz-radial-gradient(center 45deg, circle closest-side, orange 0%, red 100%);
background-image: -webkit-radial-gradient(center 45deg, circle closest-side, orange 0%, red 100%);
background-image: -ms-radial-gradient(center 45deg, circle closest-side, orange 0%, red 100%);
background-image: -o-radial-gradient(center 45deg, circle closest-side, orange 0%, red 100%);

Examples

For a more general introduction to how CSS gradients in Gecko/Firefox work, see -moz-linear-gradient .

background:    -moz-radial-gradient(45px 45px 45deg, circle cover,
				 aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background: -webkit-radial-gradient(45px 45px 45deg, circle cover,
     aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background: -ms-radial-gradient(45px 45px 45deg, circle cover,
     aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background: -o-radial-gradient(45px 45px 45deg, circle cover,
     aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background-image: -webkit-radial-gradient(45px 45px, ellipse farthest-corner,
				 aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background-image: -moz-radial-gradient(45px 45px, ellipse farthest-corner,
				 aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background-image:    -ms-radial-gradient(45px 45px, ellipse farthest-corner,
				 aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
background-image:    -o-radial-gradient(45px 45px, ellipse farthest-corner,
				 aqua 0%, rgba(0, 0, 255, 0) 100%, blue 95%);
Radial
background: -webkit-radial-gradient(45px 45px, cover, rgb(255, 0, 0) 0%, rgb(0, 0, 255) 100%);
background:    -moz-radial-gradient(45px 45px, cover, rgb(255, 0, 0) 0%, rgb(0, 0, 255) 100%);
background:    -ms-radial-gradient(45px 45px, cover, rgb(255, 0, 0) 0%, rgb(0, 0, 255) 100%);
background:    -o-radial-gradient(45px 45px, cover, rgb(255, 0, 0) 0%, rgb(0, 0, 255) 100%);

Browser compatibility

Browser Lowest version Support of
Internet Explorer

5.5 (including 8.0)

filter: progid:DXImageTransform.Microsoft.Gradient()
MSDN library, gradient filter

10

-ms-radial-gradient()

Firefox (Gecko) 3.6 (1.9.2) -moz-radial-gradient()
Opera 11.60 [1] -o-radial-gradient()
Safari / WebKit / Chrome 4.0 / 528 / 3 -webkit-gradient(radial,)
Safari Reference Library, gradients
  6 / r75891 / 10 -webkit-radial-gradient()
Safari: CSS3 Gradients
Note: unlike Gecko, WebKit supports explicitly sized gradients. See bug 627885

Note that the Mozilla syntax proposal for CSS gradients differs significantly from WebKit's original proposal:

  • Gecko (Firefox) uses separate kinds of property values to distinguish radial and linear gradients, whereas WebKit previously lumped them into a single kind of property value and needs a leading parameter to identify the type of gradient.
  • The actual syntax for how a radial gradient is specified is significantly different.
  • Webkit, Mozilla, Opera and Microsoft now implement the previous version of the W3C standard syntax. The syntax has been changed as of October 2011. The new proposed syntax is not supported in any browser.

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