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border-right - CSS（层叠样式表）编辑

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: `border-right-width`: `medium` `border-right-style`: `none` `border-right-color`: `currentcolor`
适用元素	all elements. It also applies to `::first-letter`.
是否是继承属性	否
适用媒体	visual
计算值	as each of the properties of the shorthand: `border-right-width`: the absolute length or `0` if `border-right-style` is `none` or `hidden` `border-right-style`: as specified `border-right-color`: computed color
Animation type	as each of the properties of the shorthand: `border-right-color`: a color `border-right-style`: discrete `border-right-width`: a length
正规顺序	order of appearance in the formal grammar of the values

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

<line-width> || <line-style> || <color>where 
<line-width> = <length> | thin | medium | thick
<line-style> = none | hidden | dotted | dashed | solid | double | groove | ridge | inset | outset
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where 
<rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )
<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )
<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )
<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>

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.

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