CSS解决border重叠加粗问题

在写border样式时，我们可能会遇到两个元素的border重叠导致加粗的问题。对于这个问题，有一个简单粗暴的办法，就是避免设置重复的border，通过准确设置不同元素的border-top、border-left、border-right、border-bottom来保证不会有border重叠。

然而有些场景中，这样分别设置border-top等的方法未免太过于麻烦。比如说设置表格的边框，就很难通过这种方法来避免border重叠。那么还有什么办法解决呢？

这就涉及到边框合并。

什么是边框合并？

在CSS中，边框合并是指将相邻元素的边框合并成一个单一的边框。这种效果可以使元素之间的边框看起来更加整齐和紧凑。

border-collapse属性

border-collapse属性用于指定元素的边框合并方式。它有两个可能的取值：

separate：默认值，表示边框不合并，相邻元素的边框会显示为独立的边框。
collapse：表示边框合并，相邻元素的边框会合并成一个单一的边框。

使用示例

下面是一个使用border-collapse属性的示例：

div {
  border-collapse: collapse;
  border: 1px solid black;
}

在这个示例中，我们将div元素的border-collapse属性设置为collapse，这样相邻div元素之间的边框就会合并成一个单一的边框。同时，我们还为div元素设置了1像素宽的黑色边框。

边框合并的注意事项

要想使边框合并生效，还需要注意以下几点：

1. 合并元素必须是相邻的块级元素

要实现边框合并效果，合并的元素必须是相邻的块级元素。如果两个元素之间有其他元素或者间隔，边框无法合并。

2. 元素必须有边框属性

边框合并只对具有边框属性的元素生效。如果元素没有设置边框属性，边框合并效果也无法实现。

3. 边框宽度和颜色必须相同

在进行边框合并时，相邻元素的边框宽度和颜色必须相同。如果边框宽度和颜色不同，合并后的边框将会显示为多个边框。

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