为什么nav设置右浮动会再header下面？

来源：2-2 编程练习

localhost999

2020-07-10 17:23:13

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
<title>IMOOC</title>
<style type="text/css">
    header{
        width:100%;
        height:100x;
        background-color:black;
    }
    a{
        color:white;
        text-decoration:none;
    }
    span{
        color:white;
    }
    nav{
        float:right;
        display:inline;
    }
</style>
</head>
<body>
<header>
    <div>
        <a href="#1" alt="logo"><img src="http://climg.mukewang.com/582e5f160001b17100400040.png"><span>MYMOOC</span></a>
        
    </div>
    <nav>
        <a href="#2" class="red">Home</a>
        <a href="#3" class="yellow">Course</a>
        <a href="#4" class="green">Actual</a>
        <a href="#5" class="purple">Plan</a>
        <a href="#6" class="orange">FAQ</a>
        <a href="#7" class="blue">Notes</a>
    </nav>
</header>
</body>
</html>

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