App下載
實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
    
    <h2>显示警告</h2>
    <p>w3-panel类可用于显示警告：</p>
    <div class="w3-panel w3-pale-yellow w3-border">
        <h3>警告！</h3>
         <p>黄色通常表示可能需要注意的警告。</p>
    </div>
    <div class="w3-panel w3-yellow w3-border">
        <h3>警告！</h3>
        <p>黄色通常表示可能需要注意的警告。</p>
    </div>
</body>
</html>
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運行結(jié)果