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概要
CSS repeating-linear-gradient 方法 创造一个可重复的渐变（或者<image>）. 它接受和普通线性渐变相同的属性值并且表现也一致,参考linear-gradient, but it automatically repeats the color stops infinitely in both directions, with their positions shifted by multiples of the length of a basic linear gradient (the difference between the last color stop's position and the first one's position).
The consequence is that an end color of a gradient always coincide with a start color. If both are not identical, this will result in a sharp transition.
Like any other gradient, a repeating CSS linear gradient is not a CSS <color> but an image with no intrinsic dimensions; that is, it has no natural or preferred size, nor ratio. Its concrete size will match the one of the element it applies to.
Mozilla currently only supports CSS gradients as values of the background-image property, as well as within the shorthand background. You specify a gradient value instead of an image URL.
Syntax
Formal grammar: repeating-linear-gradient( [ <angle> | to <side-or-corner> ,]? <color-stop> [, <color-stop>]+ ) \---------------------------------/ \----------------------------/ Definition of the gradient line List of color stops where<side-or-corner> = [left | right] || [top | bottom]and<color-stop> = <color> [ <percentage> | <length> ]?
repeating-linear-gradient( 45deg, blue, red ); /* A repeating gradient on 45deg axe starting blue and finishing red */
repeating-linear-gradient( to left top, blue, red); /* A repeating gradient going from the bottom right to the top left
starting blue and finishing red */
repeating-linear-gradient( 0deg, blue, green 40%, red ); /* A repeating gradient going from the bottom to top, starting blue,
being green after 40% and finishing red */
Values
<side-or-corner>- Represents the position of the starting-point of the gradient line. It consists of two keywords: the first one indicates the horizontal side,
leftorright, and the second one the vertical side,toporbottom. The order is not relevant and each of the keyword is optional.
The valuesto top,to bottom,to leftandto rightare translated into the angles0deg,180deg,270deg,90degrespectively. The others are translated into an angle that causes the starting-point to be in the same quadrant as the described corner so that the line defined by the starting-point and the corner is perpendicular to the gradient line. That way, the color described by the<color-stop>will exactly apply to the corner point. This is sometimes called the "magic corner" property. The end-point of the gradient line is the symmetrical point of the starting-point on the other direction of the center box. <angle>- An angle of direction for the gradient. See
<angle>. <color-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.
Examples
#grad1 {
background-image: repeating-linear-gradient(180deg,rgb(26,198,204),rgb(26,198,204) 7%, rgb(100,100,100) 10%);
}
#grad2 {
background-image: repeating-linear-gradient(-45deg, transparent, transparent 25px, rgba(255,255,255,1) 25px, rgba(255,255,255,1) 50px);
}
<ol>
<li>repeating gradient
<div id="grad1"></div>
</li>
<li>Zebra pattern
<div id="grad2"></div>
</li>
</ol>
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Image Values and Replaced Content Module Level 3 repeating-linear-gradient() |
Candidate Recommendation |
Browser compatibility
| Feature | Firefox (Gecko) | Chrome | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
Basic support (on background and background-image) |
3.6 (1.9.2)-moz[3] 16 (16) |
10.0 (534.16)-webkit [2][3] | 10.0 [1] | 11.10-o [3] | 5.1-webkit[2][3] |
On any properties that accept <image> |
未实现 | (Yes) | ? | ? | (Yes) |
| Legacy webkit syntax | 未实现 | 3-webkit [2] | 未实现 | 未实现 | 4.0-webkit[2] |
Legacy from syntax (without to) |
3.6 (1.9.2)-moz [4] Removed in 16 (16) |
10.0 (534.16)-webkit [2] | 10.0 | 11.10-o[4] | 5.1-webkit[2] |
to syntax |
10 (10)-moz[4] 16 (16) |
26.0 | 10.0 | 11.60-o[4] Presto 2.12 will remove the prefix. |
未实现 |
[1] Internet Explorer 5.5 through 9.0 supports proprietary filter: progid:DXImageTransform.Microsoft.Gradient() filter.
[2] WebKit since 528 supports the legacy -webkit-gradient(linear,…) function. As of WebKit 534.16, it also supports the standard gradient syntax. Unlike in Gecko, in legacy WebKit you cannot specify both a position and angle in -webkit-linear-gradient(). You can achieve the same effect by offsetting the color stops.
[3] Gecko, Opera & Webkit considers <angle> to start to the right, instead of the top. I.e. it considered an angle of 0deg as a direction indicator pointing to the right. This is different from the latest specification where an angle of 0deg as a direction indicator points to the top.
[4] Firefox 3.6 and Opera 11.10 implemented, prefixed, an early syntax where the starting corner or side was indicated without the to keyword, and effectively considered as a from position. The to syntax has been added in Firefox 10 and Opera 11.60 , at first without removing the deprecated syntax and translation between the two is trivial:
-moz-repeating-linear-gradient(to top left, blue, red);
is the same as:
-moz-repeating-linear-gradient(bottom right, blue, red);
The legacy syntax, without to, is planned to go away when the prefix is removed.
See also
- Using CSS gradients,
radial-gradient(),linear-gradient(),repeating-radial-gradient(); - Some properties where it can be used:
background-image,background.