text-underline-offset
Baseline Widely available *
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2020年11月.
* Some parts of this feature may have varying levels of support.
CSS 的 text-underline-offset 属性设置文本装饰下划线(使用 text-decoration 应用)与其原始位置的偏移距离。
尝试一下
text-underline-offset: auto; text-underline-offset: 8px; text-underline-offset: -0.5rem; <section id="default-example"> <p id="example-element">And after all we are only ordinary</p> </section> p { font: 1.5em sans-serif; text-decoration-line: underline; text-decoration-color: #ff0000; } text-underline-offset 不是 text-decoration 简写的一部分。虽然元素可以有多条 text-decoration 线,但 text-underline-offset 只影响下划线,而不影响其他可能的线装饰选项,例如 overline 或 line-through。
语法
css
/* 单个关键字 */ text-underline-offset: auto; /* length */ text-underline-offset: 0.1em; text-underline-offset: 3px; /* percentage */ text-underline-offset: 20%; /* 全局值 */ text-underline-offset: inherit; text-underline-offset: initial; text-underline-offset: revert; text-underline-offset: revert-layer; text-underline-offset: unset; text-underline-offset 属性指定为以下列出的单个值。
值
auto-
浏览器为下划线选择适当的偏移量。
<length>-
指定下划线的偏移量为
<length>,覆盖字体文件建议的和浏览器默认的值。建议使用em单位,以便偏移量随字体大小缩放。 <percentage>-
指定下划线的偏移量为元素的字体中 1 em 的
<percentage>。百分比作为相对值继承,因此会随着字体的变化而缩放。在应用了此属性后,即使存在具有不同的字体大小或垂直对齐方式的子元素,偏移量在应用下划线的整个盒子内都是恒定的。
形式定义
| 初始值 | auto |
|---|---|
| 适用元素 | 所有元素. It also applies to ::first-letter and ::first-line. |
| 是否是继承属性 | 是 |
| Percentages | refer to the font size of the element itself |
| 计算值 | as specified |
| 动画类型 | 按计算值的类型 |
形式语法
text-underline-offset =
auto |
<length-percentage>
<length-percentage> =
<length> |
<percentage>
示例
>text-underline-offset 的演示
html
<p class="oneline">Here's some text with an offset wavy red underline!</p> <br /> <p class="twolines"> This text has lines both above and below it. Only the bottom one is offset. </p> css
p { text-decoration: underline wavy red; text-underline-offset: 1em; } .twolines { text-decoration-color: purple; text-decoration-line: underline overline; } 规范
| Specification |
|---|
| CSS Text Decoration Module Level 4> # underline-offset> |