padding-bottom - CSS（层叠样式表） 编辑

CSS属性 padding-bottom 是指一个元素在内边距区域（padding area）中下方的高度。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-bottom: 0.5em;
padding-bottom: 0;
padding-bottom: 2cm;

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

/* Global values */
padding-bottom: inherit;
padding-bottom: initial;
padding-bottom: 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-bottom: 5%; }
.sidebox { padding-bottom: 10px; }

Specifications

Specification	Status	Comment
CSS Basic Box Model padding-bottom	Working Draft	No change from CSS Level 2 (Revision 1) padding-bottom.
CSS Transitions padding-bottom	Working Draft	Defines padding-bottom as animatable.
CSS Level 2 (Revision 1) padding-bottom	Recommendation	No change from CSS Level 1 padding-bottom.
CSS Level 1 padding-bottom	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)	?	?	?	?

See also

• CSS Box Model
• The padding shorthand property can be used to set paddings on all four sides of an element with a single declaration: padding-top, padding-right, padding-bottom, and padding-left.