inset

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

CSS 属性 inset 为简写属性，对应于 top、right、bottom 和 left 属性。其与 margin 简写属性具有相同的多值语法。

尝试一下

此属性虽然为 CSS 逻辑属性规范的一部分，但是无论元素的书写模式、行内方向和文本朝向如何，其所定义的都不是逻辑偏移而是实体偏移。

语法

css

/* 长度值 */
inset: 10px; /* 应用于所有边 */
inset: 4px 8px; /* 上下 | 左右 */
inset: 5px 15px 10px; /* 上 | 左右 | 下 */
inset: 2.4em 3em 3em 3em; /* 上 | 右 | 下 | 左 */

/* 包含块的宽度（左或右）或高度（上或下）的百分比 */
inset: 10% 5% 5% 5%;

/* 关键词值 */
inset: auto;

/* 全局值 */
inset: inherit;
inset: initial;
inset: revert;
inset: revert-layer;
inset: unset;

取值

inset 属性的取值与 left 属性相同。

形式定义

初始值	该简写所对应的每个属性： `top`: `auto` `bottom`: `auto` `left`: `auto` `right`: `auto`
适用元素	positioned elements
是否是继承属性	否
Percentages	relative to the containing block's size in the corresponding axis (e.g. width for left or right, height for top or bottom)
计算值	该简写所对应的每个属性： `top`: if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto` `bottom`: if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto` `left`: if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto` `right`: if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto`
动画类型	a length, percentage or calc();

形式语法

inset = 
  <'top'>{1,4}  

<top> = 
  auto                 |
  <length-percentage>  |
  <anchor()>           |
  <anchor-size()>      

<length-percentage> = 
  <length>      |
  <percentage>  

<anchor()> = 
  anchor( <anchor-name>?                  &&
  <anchor-side> , <length-percentage>? )  

<anchor-size()> = 
  anchor-size( [ <anchor-name> || <anchor-size> ]? , <length-percentage>? )  

<anchor-name> = 
  <dashed-ident>  

<anchor-side> = 
  inside        |
  outside       |
  top           |
  left          |
  right         |
  bottom        |
  start         |
  end           |
  self-start    |
  self-end      |
  <percentage>  |
  center        

<anchor-size> = 
  width        |
  height       |
  block        |
  inline       |
  self-block   |
  self-inline

示例

为元素设置偏移

HTML

html

<div>
  <span class="exampleText">示例文本</span>
</div>

CSS

css

div {
  background-color: yellow;
  width: 150px;
  height: 120px;
  position: relative;
}

.exampleText {
  writing-mode: sideways-rl;
  position: absolute;
  inset: 20px 40px 30px 10px;
  background-color: #c8c800;
}

结果

规范

Specification
CSS Logical Properties and Values Level 1 # propdef-inset

浏览器兼容性

BCD tables only load in the browser

参见

盒偏移的全称属性：top、right、bottom 和 left
对应的逻辑简写属性：inset-block 和 inset-inline
margin 简写属性的多值语法