浮动的元素一定能设置宽高

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        span {
            float: left;
            width: 100px;
            height: 30px;
            background-color: orange;
            margin-right: 10px;
        }
    </style>
</head>

<body>
    <span>1</span>
    <span>2</span>
    <span>3</span>
    <span>4</span>
</body>

</html>

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