border-bottom-width
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
CSS 属性 border-bottom-width 设置一个元素的底部边框宽度。
css
/* Keyword values */
border-bottom-width: thin;
border-bottom-width: medium;
border-bottom-width: thick;
/* <length> values */
border-bottom-width: 10em;
border-bottom-width: 3vmax;
border-bottom-width: 6px;
/* Global keywords */
border-bottom-width: inherit;
border-bottom-width: initial;
border-bottom-width: unset;
| 初始值 | medium |
|---|---|
| 适用元素 | 所有元素. It also applies to ::first-letter. |
| 是否是继承属性 | 否 |
| 计算值 | 绝对长度；或如果 border-bottom-style 的值是 none 或 hidden，则为 0 |
| 动画类型 | a length |
Syntax
Values
- <
br-width> -
定义边框宽度，取值为非负的宽度值
<length>或关键字。如果是关键字的话，其取值必须是以下之一：thin细边框 medium中等边框 thick粗边框 备注： 因为规范没有具体定义每个关键字对应的宽度值，所以实际显示效果依赖于实现。但是宽度值的取值一定遵循
thin ≤ medium ≤ thick的规律且在单文档中是常数。
Formal syntax
border-bottom-width =
<line-width>
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
Example
HTML
html
<div>Element 1</div>
<div>Element 2</div>
CSS
css
div {
border: 1px solid red;
margin: 1em 0;
}
div:nth-child(1) {
border-bottom-width: thick;
}
div:nth-child(2) {
border-bottom-width: 2em;
}
Result
Specifications
| Specification |
|---|
| CSS Backgrounds and Borders Module Level 3 # border-width |
Browser compatibility
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See also
- The other border-width-related CSS properties:
border-left-width,border-right-width,border-top-width, andborder-width. - The other border-bottom-related CSS properties:
border,border-bottom,border-bottom-style, andborder-bottom-color.