margin-right

摘要

The effect of the CSS margin-right property on the element boxmargin-right  属性 设置与元素相关联的盒子模型的右外边距。这个值可以为负值。

竖直排列相邻的两个盒子模型的外边距会重叠,称为 margin collapsing.

初始值0
适用元素all elements, except elements with table display types other than table-caption, table and inline-table. It also applies to ::first-letter and ::first-line.
是否是继承属性
Percentagesrefer to the width of the containing block
计算值the percentage as specified or the absolute length
Animation typea length

语法

/* <length> values */
margin-right: 20px;        /* An absolute length */
margin-right: 1em;         /* A length relative to the text size */
margin-right: 5%;          /* A margin relative to the nearest block container's width */

/* Keyword values */
margin-right: auto;

/* Global values */
margin-right: inherit;
margin-right: initial;
margin-right: unset;

<length>
一个固定宽度 <length>值:可以是一个绝对宽度,e.g. in px, 也可以是一个相对宽度,e.g. in em, 或者相对视窗的大小,e.g. in vh.
<percentage>
以百分比为单位的 margin 值,计算时是相对于其最近的父级容器的宽度。
auto
auto 关键词表示在当前布局模式下,浏览器根据接收的左边距自动计算出外边距。如果有几组 margin-left 和 margin-right 设置为 auto,那么最后计算的空间分布,会根据 display,float,position 属性,自动生成以下几种情况:
Value of display Value of float Value of position Computed value of auto Comment
inline, inline-block, inline-table any static or relative 0 Inline layout mode
block, inline, inline-block, block, table, inline-table, list-item, table-caption any static or relative 0, except if both margin-left and margin-right are set to auto. In this case, it is set to the value centering the element inside its parent. Block layout mode
block, inline, inline-block, block, table, inline-table, list-item, table-caption left or right static or relative 0 Block layout mode (floating element)
any table-*, except table-caption any any 0 Internal table-* elements don't have margins, use border-spacing instead
any, except flex, inline-flex, or table-* any fixed or absolute 0, except if both margin-left and margin-right are set to auto. In this case, it is set to the value centering the border area inside the available width, if fixed. Absolutely positioned layout mode
flex, inline-flex any any 0, except if there is any positive horizontal free space. In this case, it is evenly distributed to all horizontal auto margins. Flexbox layout mode

形式语法

margin-right = 
<length-percentage> |
auto

<length-percentage> =
<length> |
<percentage>

实例

.content { margin-right: 5%; }
.sidebox { margin-right: 10px; }
.logo    { margin-right: -5px; }

说明

Specification Status Comment
CSS Box Model
margin-right
Candidate Recommendation No significant change
CSS Transitions
margin-right
Working Draft Defines margin-right as animatable.
CSS Flexible Box Layout Module
margin-right
Candidate Recommendation Defines the behavior of margin-right on flex items.
CSS Level 2 (Revision 1)
margin-right
Recommendation Removes its effect on inline elements.
CSS Level 1
margin-right
Recommendation Initial definition

浏览器兼容性

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