css匹配括号里的内容

CSS中的括号匹配是一项非常重要的基础知识。在CSS中，括号主要用于表示选择器的不同属性。CSS括号的一般用法如下：

p{
    font-size: 14px;
    color: #333;
}

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In this example,the curly braces {} surrounding the font-size and color properties indicate that they belong to the p selector.

Another common use of CSS brackets is to group a set of selectors together so that they share the same set of properties. Here is an example:

p,a {
    font-size: 14px;
    color: #333;
}

In this example,the comma "," inside the curly braces {} indicates that the font-size and color properties should be applied to both the p and a selectors.

Finally,brackets can also be used to represent values in CSS,as in the following example which defines a linear gradient:

background: linear-gradient(to bottom,#fff,#000);

In this case,the round brackets () are used to specify the direction of the gradient,while the curly braces {} are used to define the range of colors that the gradient should include.

总之，在CSS中，括号扮演重要的角色，它们标志着选择器的属性集合（用花括号{}）。括号还可用于将选择器分组，或为某些属性指定数值。