border-image-source

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⁩.

border-image-source CSS 属性设置用以创建元素边框图像的源图像。

尝试一下

border-image-source: url("/shared-assets/images/examples/border-diamonds.png");

border-image-source: url("/shared-assets/images/examples/border-stars.png");

border-image-source: repeating-linear-gradient(
  45deg,
  transparent,
  #4d9f0c 20px
);

border-image-source: none;

<section id="default-example">
  <div id="example-element">This is a box with a border around it.</div>
</section>

#example-element {
  width: 80%;
  height: 80%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 50px;
  background: #fff3d4;
  color: #000;
  border: 30px solid;
  border-image: url("/shared-assets/images/examples/border-diamonds.png") 30
    round;
  font-size: 1.2em;
}

border-image-slice 属性用于将源图像分割为多个区域，然后动态地应用到最终的边框图像。

语法

css

/* 关键字值 */
border-image-source: none;

/* <image> 值 */
border-image-source: url(image.jpg);
border-image-source: linear-gradient(to top, red, yellow);

/* 全局值 */
border-image-source: inherit;
border-image-source: initial;
border-image-source: revert;
border-image-source: revert-layer;
border-image-source: unset;

值

none: 不使用边框图像，而由 border-style 定义所展现的外观。
<image>: 用作边框的图片引用。

形式定义

初始值	`none`
适用元素	all elements, except internal table elements when `border-collapse` is `collapse`. It also applies to `::first-letter`.
是否是继承属性	否
计算值	`none` or the image with its URI made absolute
动画类型	离散值

形式语法

border-image-source = 
  none     |
  <image>  

<image> = 
  <url>           |
  <image()>       |
  <image-set()>   |
  <cross-fade()>  |
  <element()>     |
  <gradient>      

<image()> = 
  image( <image-tags>? [ <image-src>? , <color>? ]! )  

<image-set()> = 
  image-set( <image-set-option># )  

<cross-fade()> = 
  cross-fade( <cf-image># )  

<element()> = 
  element( <id-selector> )  

<image-tags> = 
  ltr  |
  rtl  

<image-src> = 
  <url>     |
  <string>  

<image-set-option> = 
  [ <image> | <string> ] [ <resolution> || type( <string> ) ]?  

<cf-image> = 
  [ <image> | <color> ]  &&
  <percentage [0,100]>?  

<id-selector> = 
  <hash-token>

示例

基础示例

css

.box {
  border-image-source: url("image.png");
}

规范

Specification
CSS Backgrounds and Borders Module Level 3 # border-image-source

浏览器兼容性

参见

border
outline
box-shadow
background-image
<url> 类型
MDN 博客：CSS 中的边框图像：Interop 2023 的重点关注领域（2023）

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