radial-gradient()
CSS
function
creates an image consisting of a progressive transition between two or more colors that radiate from an origin. Its shape may be a circle or an ellipse. The function's result is an object of the
<gradient>
data type, which is a special kind of
<image>
.
/* A gradient at the center of its container, starting red, changing to blue, and finishing green */ radial-gradient(circle at center, red 0, blue, green 100%)
A radial gradient is specified by indicating the center of the gradient (where the 0% ellipse will be) and the size and shape of the ending shape (the 100% ellipse).
<position>
background-position
or
transform-origin
. If unspecified, it defaults to
center
.
<ending-shape>
circle
(meaning that the gradient's shape is a circle with a constant radius) or
ellipse
(meaning that the shape is an axis-aligned ellipse). If unspecified, it defaults to
ellipse
.
<size>
<size>
:
| Keyword | 描述 |
|---|---|
closest-side
|
The gradient's ending 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 ending shape is sized so that it exactly meets the closest corner of the box from its center. |
farthest-side
|
类似于
closest-side
, except the ending shape is sized to meet the side of the box farthest from its center (or vertical and horizontal sides).
|
farthest-corner
|
The default value, the gradient's ending shape is sized so that it exactly meets the farthest corner of the box from its center. |
若
<ending-shape>
is specified as
circle
or is omitted, the size may be given explicitly as a
<length>
, which provides an explicit circle radius. Negative values are invalid.
若
<ending-shape>
is specificed as
ellipse
or is ommitted, the size may be given as a
<length-percentage>
with two values to provide an explicit ellipse size. The first value represents the horizontal radius, the second the vertical radius. Percentages values are relative to the corresponding dimension of the gradient box. Negative values are invalid.
<linear-color-stop>
<color>
value, followed by an one or two optional stop positions (either a
<percentage>
或
<length>
along the gradient's axis). A percentage of
0%
, or a length of
0
, represents the center of the gradient; the value
100%
represents the intersection of the ending shape with the virtual gradient ray. Percentage values in between are linearly positioned on the gradient ray. Including two stop positions is equivalent to declaring two color stops with the same color at the two positions.
<color-hint>
Th color-hint is an interpolation hint defining how the gradient progresses between adjacent color stops. The length defines at which point between two color stops the gradient color should reach the midpoint of the color transition. If omitted, the midpoint of the color transition is the midpoint between two color stops.
As with any gradient, a radial gradient has no intrinsic dimensions ; i.e., it has no natural or preferred size, nor a preferred ratio. Its concrete size will match the size of the element it applies to.
To create a radial gradient that repeats so as to fill its container, use the
repeating-radial-gradient()
function instead.
因为
<gradient>
s belong to the
<image>
data type, they can only be used where
<image>
s can be used. For this reason,
radial-gradient()
won't work on
background-color
and other properties that use the
<color>
data type.
A radial gradient is defined by a
center point
, an
ending shape
, and two or more
color-stop points
.
To create a smooth gradient, the
radial-gradient()
function draws a series of concentric shapes radiating out from the center to the
ending shape
(and potentially beyond). The ending shape may be either a circle or an ellipse.
Color-stop points are positioned on a
virtual gradient ray
that extends horizontally from the center towards the right. Percentage-based color-stop positions are relative to the intersection between the ending shape and this gradient ray, which represents
100%
. Each shape is a single color determined by the color on the gradient ray it intersects.
<div class="radial-gradient"></div>
.radial-gradient {
width: 240px;
height: 120px;
}
.radial-gradient {
background-image: radial-gradient(cyan 0%, transparent 20%, salmon 40%);
}
<div class="radial-gradient"></div>
.radial-gradient {
width: 240px;
height: 120px;
}
.radial-gradient {
background-image: radial-gradient(farthest-corner at 40px 40px,
#f35 0%, #43e 100%);
}
Please see Using CSS gradients 了解更多范例。
| 规范 | 状态 | 注释 |
|---|---|---|
|
CSS Images Module Level 3
The definition of 'radial-gradients()' in that specification. |
候选推荐 | 初始定义。 |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
radial-gradient()
|
Chrome 完整支持 26 | Edge 完整支持 12 |
Firefox
完整支持
16
注意事项
|
IE
完整支持
10
注意事项
|
Opera
完整支持
12.1
|
Safari
完整支持
6.1
|
WebView Android 完整支持 ≤37 | Chrome Android 完整支持 26 |
Firefox Android
完整支持
16
注意事项
|
Opera Android
完整支持
12.1
|
Safari iOS
完整支持
6.1
|
Samsung Internet Android 完整支持 1.5 |
at
syntax
|
Chrome 完整支持 26 | Edge 完整支持 12 |
Firefox
完整支持
16
注意事项
|
IE 完整支持 10 |
Opera
完整支持
15
|
Safari 不支持 No | WebView Android 完整支持 ≤37 | Chrome Android 完整支持 26 |
Firefox Android
完整支持
16
|
Opera Android
完整支持
14
|
Safari iOS 不支持 No | Samsung Internet Android 完整支持 1.5 |
| Double-position color stops | Chrome 完整支持 71 | Edge 完整支持 79 | Firefox 完整支持 64 | IE 不支持 No | Opera 完整支持 58 | Safari 完整支持 12.1 | WebView Android 完整支持 71 | Chrome Android 完整支持 71 | Firefox Android 完整支持 64 | Opera Android 完整支持 50 | Safari iOS 完整支持 12.2 | Samsung Internet Android 完整支持 10.0 |
| Interpolation Hints / Gradient Midpoints | Chrome 完整支持 40 | Edge 完整支持 79 | Firefox 完整支持 36 | IE 不支持 No | Opera 完整支持 27 | Safari 完整支持 6.1 | WebView Android 完整支持 40 | Chrome Android 完整支持 40 | Firefox Android 完整支持 36 | Opera Android 完整支持 27 | Safari iOS 完整支持 6.1 | Samsung Internet Android 完整支持 4.0 |
完整支持
不支持
见实现注意事项。
用户必须明确启用此特征。
要求使用供应商前缀或不同名称。
Gecko used to have a long-standing bug whereby radial gradients like
radial-gradient(circle gold,red)
would work, even though they shouldn't because of the missing comma between
circle
and
gold
. Also,
calc()
expressions were rejected — causing the value to be invalid — when used as the radius component of a
radial-gradient()
function (
bug 1376019
). Firefox's new parallel CSS engine (also known as
Quantum CSS
or
Stylo
, released in Firefox 57) fixed these bugs.
repeating-radial-gradient()
,
linear-gradient()
,
repeating-linear-gradient()
,
conic-gradient()
,
repeating-conic-gradient()
<image>
image()
element()
image-set()
cross-fade()