CSS :focus 伪类的用法

您可以尝试运行以下代码来实现 :focus 伪类

示例

现场演示

<!DOCTYPE html>
<html>
   <head>
      <style>
         input:focus {
            background-color: orange;
         }
      </style>
   </head>
   <body>
      <form action = "">
         Subject <input type = "text" name = "subject"><br>
         Student: <input type = "text" name = "student"><br>
         Age: <input type = "number" name = "age"><br>
         <input type = "submit" value = "Submit">
      </form>
   </body>
</html>

输出

CSS :focus 伪类的用法

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