margin-right - CSS（层叠样式表）编辑

摘要

The effect of the CSS margin-right property on the element box 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`.
是否是继承属性	否
Percentages	refer to the width of the containing block
适用媒体	visual
计算值	the percentage as specified or the absolute length
Animation type	a length
正规顺序	the unique non-ambiguous order defined by the formal grammar

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. 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

<length> | <percentage> | auto

实例

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

说明

Specification	Status	Comment
CSS Basic Box Model margin-right	Working Draft	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

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