border-block-start-width

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 border-block-start-width 定义了元素的逻辑块首的边框宽度,并根据元素的书写模式、行内方向和文本朝向对应至实体边框宽度。根据 writing-modedirectiontext-orientation 所定义的值,此属性对应于 border-top-widthborder-right-widthborder-bottom-widthborder-left-width 属性。

尝试一下

语法

css
/* 边框宽度值 */
border-block-start-width: 5px;
border-block-start-width: thick;

/* 全局值 */
border-block-start-width: inherit;
border-block-start-width: initial;
border-block-start-width: revert;
border-block-start-width: revert-layer;
border-block-start-width: unset;

与此相关的属性有 border-block-end-widthborder-inline-start-widthborder-inline-end-width,这些属性定义了元素其他边框的宽度。

初始值medium
适用元素所有元素
是否是继承属性
Percentageslogical-width of containing block
计算值absolute length; 0 if the border style is none or hidden
动画类型按计算值的类型

取值

<'border-width'>

边框宽度。见 border-width

形式定义

初始值medium
适用元素所有元素
是否是继承属性
Percentageslogical-width of containing block
计算值absolute length; 0 if the border style is none or hidden
动画类型按计算值的类型

形式语法

border-block-start-width = 
<line-width>

<line-width> =
<length [0,∞]> |
thin |
medium |
thick

示例

竖排文本的边框宽度

HTML

html
<div>
  <p class="exampleText">示例文本</p>
</div>

CSS

css
div {
  background-color: yellow;
  width: 120px;
  height: 120px;
}

.exampleText {
  writing-mode: vertical-lr;
  border: 1px solid blue;
  border-block-start-width: 5px;
}

结果

规范

Specification
CSS Logical Properties and Values Level 1
# border-width

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
border-block-start-width

Legend

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Full support
Full support

参见