margin-right
摘要
margin-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 | 否 |
Percentages | refer to the width of the containing block |
计算值 | the percentage as specified or the absolute length |
Animation type | a 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;
值
<length>
-
一个固定宽度
<length>
值:可以是一个绝对宽度,e.g. inpx
, 也可以是一个相对宽度,e.g. inem
, 或者相对视窗的大小,e.g. invh
. <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
orrelative
0
Inline layout mode block
,inline
,inline-block
,block
,table
,inline-table
,list-item
,table-caption
any static
orrelative
0
, except if bothmargin-left
andmargin-right
are set toauto
. 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
orright
static
orrelative
0
Block layout mode (floating element) any table-*
, excepttable-caption
any any 0
Internal table-*
elements don't have margins, useborder-spacing
insteadany, except flex
,inline-flex
, ortable-*
any fixed
orabsolute
0
, except if bothmargin-left
andmargin-right
are set toauto
. In this case, it is set to the value centering the border area inside the availablewidth
, 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 horizontalauto
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; }
规范
Specification |
---|
CSS Box Model Module Level 3 # margin-physical |
浏览器兼容性
BCD tables only load in the browser