iframe实战练习

今天的iframe实战练习
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>实战练习-后台小案例</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
            box-sizing: border-box;
        }
        body{
              display: grid;
        }
        header{
            width: 100%;
            height: 160px;
            background-color: aqua;
            display: flex;
            place-items: center;
        }
        header h1{
            color: brown;
            margin-left: 20px;
        }
        header section{
            display: flex;
            margin-left: auto;
        }
        header span{
            margin-right: 20px;
        }
         header button{
            margin-right: 20px;
        }
        nav{
            background-color: rgb(235, 20, 20);
            display: grid;
            width: 15%;
            text-align: center;
            margin-top : 5px;
        }
        a{
            text-decoration: none;
        }
        iframe{
            margin-top: 5px;
            width: 70%;
            height: 100%;
            background-color: rgb(142, 178, 245);
        }
    </style>
</head>
<body>
   <!-- 后台顶部 -->
   <header>
       <h1>学生管理系统</h1>
       <section>
        <span>admin</span>
        <button>退出</button>
       </section>
   </header>
   <!-- 后台左侧 -->
      <nav>
        <a href="./表单-实战练习.html" target="content">登录页面</a>
        <a href="实战-课程表.html" target="content">课程表</a>
        <a href="./iframe+a.html" target="content">iframe练习</a>
        <a href="./购物清单.html" target="content">购物清单</a>
        <a href="" target="content">元素属性</a>
        <a href="" target="content">元素属性</a>
        <a href="" target="content">元素属性</a>
        <a href="" target="content">元素属性</a>
      </nav>
   <!-- 后台右侧 -->
   <iframe src="" frameborder="0" name="content" width="100%" height="100%"></iframe>
</body>
</html>
运行效果：
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