border-right

CSS 属性 border-right 是属性border-right-color, border-right-style, 和border-right-width的三者的缩写。这些属性都是在描述一个元素的右边的边框border

border-right: 1px;
border-right: 2px dotted;
border-right: medium dashed green;

和 CSS 所有的缩写属性一样,border-right 总是会设置该缩写属性所包含的全部属性值,即使开发者并没有一一指定这些值。CSS 缩写属性会给没有被定义的属性一个默认的属性值。那就意味着下面这个例子......

border-right-style: dotted;
border-right: thick green;

......实际上应该是下面这个样子......

  border-right-style: dotted;
  border-right: none thick green;

 ......并且在 border-right 之前定义的 border-right-style 的值也会被覆盖。由于border-right-style 的默认值是 none, border-style 的最终结果就是没有边框。

初始值as each of the properties of the shorthand:
适用元素all elements. It also applies to ::first-letter.
是否是继承属性
计算值as each of the properties of the shorthand:
Animation typeas each of the properties of the shorthand:

Syntax

这三种属性值的缩写需要按照顺序定义数值,也可以省略其中的一个或者两个。

Values

<br-width> 
请参阅 border-right-width.
<br-style> 
请参阅 border-right-style.
<color>
请参阅 border-right-color.

Formal syntax

border-right = 
<line-width> ||
<line-style> ||
<color>

<line-width> =
<length [0,∞]> |
thin |
medium |
thick

<line-style> =
none |
hidden |
dotted |
dashed |
solid |
double |
groove |
ridge |
inset |
outset

<color> =
<absolute-color-base> |
currentcolor |
<system-color> |
<device-cmyk()>

<absolute-color-base> =
<hex-color> (en-US) |
<named-color> |
transparent |
<rgb()> |
<rgba()> |
<hsl()> |
<hsla()> |
<hwb()> |
<lab()> |
<lch()> |
<oklab()> |
<oklch()> |
<color()>

<device-cmyk()> =
device-cmyk( <cmyk-component>{4} [ / <alpha-value> ]? )

<rgb()> =
rgb( [ <percentage> | none ]{3} [ / [ <alpha-value> | none ] ]? ) |
rgb( [ <number> | none ]{3} [ / [ <alpha-value> | none ] ]? )

<hsl()> =
hsl( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )

<hwb()> =
hwb( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )

<lab()> =
lab( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ / [ <alpha-value> | none ] ]? )

<lch()> =
lch( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <hue> | none ] [ / [ <alpha-value> | none ] ]? )

<oklab()> =
oklab( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ / [ <alpha-value> | none ] ]? )

<oklch()> =
oklch( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <hue> | none ] [ / [ <alpha-value> | none ] ]? )

<color()> =
color( <colorspace-params> [ / [ <alpha-value> | none ] ]? )

<cmyk-component> =
<number> |
<percentage>

<alpha-value> =
<number> |
<percentage>

<hue> =
<number> |
<angle> |
none

<colorspace-params> =
<predefined-rgb-params> |
<xyz-params>

<predefined-rgb-params> =
<predefined-rgb> [ <number> | <percentage> | none ]{3}

<xyz-params> =
<xyz-space> [ <number> | none ]{3}

<predefined-rgb> =
srgb |
srgb-linear |
display-p3 |
a98-rgb |
prophoto-rgb |
rec2020

<xyz-space> =
xyz |
xyz-d50 |
xyz-d65

Example

<div>
  This box has a border on the right side.
</div>
div {
  border-right: 4px dashed blue;
  background-color: gold;
  height: 100px;
  width: 100px;
  font-weight: bold;
  text-align: center;
}

Specifications

Specification Status Comment
CSS Backgrounds and Borders Module Level 3
border-right
Candidate Recommendation No direct changes, though the modification of values for the border-right-color do apply to it.
CSS Level 2 (Revision 1)
border-right
Recommendation No significant changes.
CSS Level 1
border-right
Recommendation Initial definition.

Browser compatibility

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