padding-left

CSS属性 padding-left 是指一个元素在内边距区域（padding area）中左边的宽度。内边距（padding）是指一个元素的内容和边框之间的区域。和外边距（margin）不同，内边距（padding）是不允许有负值的。内边距（padding）可以用四个值声明一个元素的四个方向的内边距（paddings），这是一种CSS缩写属性。

/* <length> values */
padding-left: 0.5em;
padding-left: 0;
padding-left: 2cm;

/* <percentage> value */
padding-left: 10%;

/* Global values */
padding-left: inherit;
padding-left: initial;
padding-left: unset;

初始值	`0`
适用元素	all elements, except `table-row-group`, `table-header-group`, `table-footer-group`, `table-row`, `table-column-group` and `table-column`. 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

Values

length: 当内边距（padding）大小是一个固定单位数值的时候，一定不能为负数。
percentage: 当内边距（padding）是一个百分比的时候，百分比是和本身包含的元素的宽度有关的，同样一定不能为负数。

Formal syntax

<length> | <percentage>

Examples

.content { padding-left: 5%; }
.sidebox { padding-left: 10px; }

Specifications

Specification	Status	Comment
CSS Basic Box Model padding-left	Working Draft	No change.
CSS Transitions padding-left	Working Draft	Defines `padding-left` as animatable.
CSS Level 2 (Revision 1) padding-left	Recommendation	No change.
CSS Level 1 padding-left	Recommendation	Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Desktop
Mobile

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0	(Yes)	1.0 (1.0)	4.0	3.5	1.0 (85)

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	(Yes)	?	?	?	?