try_w3examples_103 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<div class="w3-container">
    <h2>关闭警报</h2>
    <p>要关闭警报，请单击右上角的X：</p>
    <div class="w3-panel w3-red w3-display-container">
  <span onclick="this.parentElement.style.display='none'"
        class="w3-button w3-large w3-display-topright">&times;</span>
        <h3>危险！</h3>
        <p>红色通常表示危险或负面情况。</p>
    </div>
    <div class="w3-panel w3-yellow w3-display-container">
  <span onclick="this.parentElement.style.display='none'"
        class="w3-button w3-large w3-display-topright">&times;</span>
        <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-green w3-display-container">
  <span onclick="this.parentElement.style.display='none'"
        class="w3-button w3-large w3-display-topright">&times;</span>
        <h3>成功！</h3>
        <p>绿色常表示成功或积极。</p>
    </div>
    <div class="w3-panel w3-blue w3-display-container">
 
 
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运行结果
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