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
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.