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CSS outline-style属性
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An outline is a line that is drawn around elements, outside the border edge, to make the element "stand out". The outline-style property sets the style of the outlines.
outline为环绕元素的线条轮廓，位置在边框边缘的外面，可以让元素"突出"。outline-style属性可以设置线条轮廓的样式。
Note: Outlines do not take up space, and they do not have to be rectangular.
注意：Outlines 不会占据空间，而且它们不一定得呈现为直角
Inherited: No
继承性：无
举例
| button |
可用值
| 值 | 描述 |
|---|---|
| none | Defines no outlines 没有线条轮廓 |
| dotted | Defines a dotted outline 以点线表示的线条轮廓 |
| dashed | Defines a dashed outline 以分裂线表示的线条轮廓 |
| solid | Defines a solid outline 线形线条轮廓 |
| double | Defines two lines around the element. The width of the two lines are the same as the outline-width value 双线线条轮廓，宽度由outline-width的值指定 |
| groove | Defines a 3D grooved outline. The effect depends on the outline-color value 3D凹槽线条轮廓，效果由outline-color 的值决定 |
| ridge | Defines a 3D ridged outline. The effect depends on the outline-color value 3D棱纹线条轮廓，效果由outline-color 的值决定 |
| inset | Defines a 3D inset outline. The effect depends on the outline-color value 3D内嵌线条轮廓，效果由outline-color 的值决定 |
| outset | Defines a 3D outset outline. The effect depends on the outline-color value 3D突出线条轮廓。效果由outline-color 的值决定 |
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