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outline-offset - CSS（层叠样式表）编辑

概要

outline-offset CSS 属性用于设置 outline 与一个元素边缘或边框之间的间隙。

outline是元素的轮廓，悬浮在元素边框之上。元素和其轮廓之间是透明的。也就是说，它们之间的颜色会继承父元素的背景色。

初始值	`0`
适用元素	all elements
是否是继承属性	否
适用媒体	as each of the properties of the shorthand: `visual`: Value not found in DB! `interactive`: Value not found in DB!
计算值	as specified, but with relative lengths converted into absolute lengths
Animation type	a length
正规顺序	the unique non-ambiguous order defined by the formal grammar

The space will be transparent (the parent will determine the background).

Syntax

/* <length> values */
outline-offset: 3px;
outline-offset: 0.2em;

/* Global values */
outline-offset: inherit;
outline-offset: initial;
outline-offset: unset;

Values

<length>: 元素和轮廓间的宽度. 详见 <length> . 负值将轮廓绘制在元素之内.

Formal syntax

<length>

Examples

p {
  outline: dashed thin;
  /* Move the outline 10px away from the border */
  outline-offset: 10px;
  border:1px solid black;
}

Html

<p>outline: offset 10px. Border is solid and outline is dashed</p>

上面的代码将产生以下效果:

另一个例子:

outline: multiple offsets;

Specifications

Specification	Status	Comment
CSS Transitions outline-offset	Working Draft	Defines `outline-offset` as animatable.
CSS Basic User Interface Module Level 3 outline-offset	Recommendation	Initial definition

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