现场演示：我的 HTML 文档

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CSS Set Maximum Width of an Element</title>
<style>     
    div {
        width: 300px;
        max-width: 200px;
        background: #bbb3ff;
    }
    p {
        float: left;
        max-width: 400px;
        background: #eee8aa;
    }
</style>
</head>
<body>
    <div>The maximum width of this div element is set to 200px, so it can't be wider than that.</div>
    <p>Enter some text to see how it works.</p>
</body>
</html>