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CSS outline-width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-width property sets the width 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-width属性可设置线条轮廓宽度。
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 |
|---|---|
| thin | Defines thin outlines 细型线条轮廓 |
| medium | Defines medium outlines 中等宽度的线条轮廓 |
| thick | Defines thick outlines 粗型线条轮廓 |
| length | Allows you to define the thickness of the outlines 定义具体的线条轮廓粗细 |
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