ID选择器

概述

在一个HTML文档中,CSS ID 选择器会根据该元素的ID属性中的内容匹配元素,元素ID属性名必须与选择器中的ID属性名完全匹配，此条样式声明才会生效。

语法

#id属性 {样式声明 }

注意它与下面的语句等价 attribute selector:

[id=id属性] {样式声明 }

示例

span#identified {
  background-color: DodgerBlue;
}

上面的CSS作用于下面的HTML代码:

  <span id="identified">Here's a span with some text.</span>
  <span>Here's another.</span>

则会产生下面的效果:

Here's a span with some text.
Here's another.

规范

浏览器兼容性

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See also