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Summary
margin-left
属性 设置与元素相关联的盒子模型的左外边距。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 margin collapsing。
在长度(width)被约束这种极少情况下,( 即当所有的宽度,左边界,边界,填充内容区域和边缘都被定义
), 左边界会被忽略,
如果被制定为auto值,会有相同的计算值。
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 |
Syntax
/* <length> values */ margin-left: 10px; /* 绝对长度 */ margin-left: 1em; /* 相对于字号的长度 */ margin-left: 5%; /* 相对最近块元素的宽度 */ /* Keyword values */ margin-left: auto; /* Global values */ margin-left: inherit; margin-left: initial; margin-left: unset;
Values
<length>
- 一个固定宽度
<length>
值 : 可以是一个绝对宽度, e.g. inpx
, 也可以是个相对宽度, e.g. inem
, 或者相对视窗的大小, e.g. invh
. <percentage>
- 百分比值
<percentage>
最近的块容器的宽度 width . 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
, 除非margin-left
和margin-right同时都设置为auto
. 这样的话,元素就被设置为基于父元素居中。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
Formal syntax
<length> | <percentage> | auto
Examples
.content { margin-left: 5%; } .sidebox { margin-left: 10px; } .logo { margin-left: -5px; }
Specifications
Specification | Status | Comment |
---|---|---|
CSS Basic Box Model margin-left |
Working Draft | No significant change from CSS 2.1. |
CSS Transitions margin-left |
Working Draft | Defines margin-left as animatable. |
CSS Flexible Box Layout Module margin-left |
Candidate Recommendation | Defines the behavior of margin-left on flex items. |
CSS Level 2 (Revision 1) margin-left |
Recommendation | Like in CSS1, but removes its effect on inline elements. |
CSS Level 1 margin-left |
Recommendation | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 1.0 | 1.0 (1.7 or earlier) | 3.0 | 3.5 | 1.0 (85) |
auto value |
1.0 | 1.0 (1.7 or earlier) | 6.0 (strict mode) | 3.5 | 1.0 (85) |
Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support | 1.0 | 1.0 (1) | 6.0 | 6.0 | 1.0 |