border-start-start-radius

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-start-start-radius 定义了元素的逻辑边框半径,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半径。此属性便于构建适应各种文本朝向书写模式的样式。

尝试一下

此属性影响元素块首与行首之间的拐角。例如在 horizontal-tb 书写模式和 ltr 行内方向下,此属性对应于 border-top-left-radius 属性。

语法

css
/* 长度值 */
/* 使用一个值所得拐角为圆形 */
border-start-start-radius: 10px;
border-start-start-radius: 1em;

/* 使用两个值所得拐角为椭圆形 */
border-start-start-radius: 1em 2em;

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

取值

<length-percentage>

表示圆的半径或者椭圆半长轴和半短轴的尺寸。表示绝对尺寸可用 CSS <length> 数据类型所允许的任意单位。水平轴的百分比参照盒的宽度,竖直轴的百分比参照盒的高度。负值无效。

形式定义

初始值0
适用元素all elements; but User Agents are not required to apply to table and inline-table elements when border-collapse is collapse. The behavior on internal table elements is undefined for the moment.. It also applies to ::first-letter.
是否是继承属性
Percentagesrefer to the corresponding dimension of the border box
计算值two absolute <length>s or <percentage>s
动画类型a length, percentage or calc();

形式语法

border-start-start-radius = 
<length-percentage [0,∞]>{1,2}

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

示例

竖排文本的边框半径

HTML

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

CSS

css
div {
  background-color: rebeccapurple;
  width: 120px;
  height: 120px;
  border-start-start-radius: 10px;
}

.exampleText {
  writing-mode: vertical-rl;
  padding: 10px;
  background-color: #fff;
  border-start-start-radius: 10px;
}

结果

规范

Specification
CSS Logical Properties and Values Level 1
# border-radius-properties

浏览器兼容性

BCD tables only load in the browser

参见