border-image-outset

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句法
形式定义
形式句法
范例
规范
浏览器兼容性
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border-image-outset CSS property sets the distance by which an element's border image is set out from its border box.

The parts of the border image that are rendered outside the element's border box with border-image-outset do not trigger overflow scrollbars and don't capture mouse events.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

/* <length> value */
border-image-outset: 1rem;
/* <number> value */
border-image-outset: 1.5;
/* vertical | horizontal */
border-image-outset: 1 1.2;
/* top | horizontal | bottom */
border-image-outset: 30px 2 45px;
/* top | right | bottom | left */
border-image-outset: 7px 12px 14px 5px;
/* Global values */
border-image-outset: inherit;
border-image-outset: initial;
border-image-outset: unset;

border-image-outset property may be specified as one, two, three, or four values. Each value is a <length> or <number> . Negative values are invalid and will cause the border-image-outset declaration to be ignored.

若 one value is specified, it applies to all four sides .
若 two values are specified, the first applies to the top and bottom and the second to the left and right .
若 three values are specified, the first applies to the top , the second to the left and right , and the third to the bottom .
若 four values are specified, they apply to the top , right , bottom ，和 left in that order (clockwise).

值

<length>: The size of the border-image outset as a dimension — a number with a unit.
<number>: The size of the border-image outset as a multiple of the element's corresponding border-width s. For example, if an element has border-width: 1em 2px 0 1.5rem ，和 border-image-outset: 2 , the final border-image-outset would be calculated as 2em 4px 0 3rem .

形式定义

初始值	`0`
适用于	all elements, except internal table elements when `border-collapse` is `collapse` . It also applies to `::first-letter` .
继承	no
计算值	as specified, but with relative lengths converted into absolute lengths
动画类型	by computed value type

形式句法

[ <length> | <number> ]{1,4}

范例

Outsetting a border image

HTML

<div id="outset">This element has an outset border image!</div>

CSS

#outset {
  width: 10rem;
  background: #cef;
  border: 1.4rem solid;
  border-image: radial-gradient(#ff2, #55f) 40;
  border-image-outset: 1.5;  /* 1.5 × 1.4rem = 2.1rem */
  margin: 2.1rem;
}

结果

规范

规范	状态	注释
CSS Backgrounds and Borders Module Level 3 The definition of 'border-image-outset' in that specification.	候选推荐	初始定义

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`border-image-outset`	Chrome 完整支持 15	Edge 完整支持 12	Firefox 完整支持 15	IE 完整支持 11	Opera 完整支持 15	Safari 完整支持 6	WebView Android 完整支持 ≤37	Chrome Android 完整支持 18	Firefox Android 完整支持 15	Opera Android 完整支持 14	Safari iOS 完整支持 6	Samsung Internet Android 完整支持 1.0

图例

完整支持

元数据

最后修改： Jul 24, 2020

在此页

句法

值

形式定义

形式句法

范例

Outsetting a border image

HTML

CSS

结果

规范

浏览器兼容性

图例

相关话题