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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。
An outline is a line that is drawn around elements, outside the border edge.
| 初始值 | 0 |
|---|---|
| 适用元素 | all elements |
| 是否是继承属性 | 否 |
| 适用媒体 | visual, interactive |
| 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>- The width of the space. See
<length>for possible units. Negative values place the outline inside the element.
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>
The code above produces this effect:
Another example:
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 |
Proposed Recommendation | Initial definition |
Browser compatibility
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 1.0 | 1.5 (1.8) | 未实现 | 9.5 | 1.2 |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | ? | ? | ? | ? | ? |