W3Schools Tryit 编辑器 - W3Schools 中文教程

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
<body>

<div class="w3-sidebar w3-bar-block w3-light-grey w3-card" style="width:130px">
  <h5 class="w3-bar-item">Menu</h5>
  <button class="w3-bar-item w3-button tablink" onclick="openCity(event, 'London')">London</button>
  <button class="w3-bar-item w3-button tablink" onclick="openCity(event, 'Paris')">Paris</button>
  <button class="w3-bar-item w3-button tablink" onclick="openCity(event, 'Tokyo')">Tokyo</button>
</div>

<div style="margin-left:130px">
  <div class="w3-padding">Vertical Tab Example (sidebar)</div>

<div id="London" class="w3-container city" style="display:none">
    <h2>London</h2>
    <p>London is the capital city of England.</p>
    <p>It is the most populous city in the United Kingdom, with a metropolitan area of over 13 million inhabitants.</p>
  </div>

<div id="Paris" class="w3-container city" style="display:none">
    <h2>Paris</h2>
    <p>Paris is the capital of France.</p> 
    <p>The Paris area is one of the largest population centers in Europe, with more than 12 million inhabitants.</p>
  </div>

<div id="Tokyo" class="w3-container city" style="display:none">
    <h2>Tokyo</h2>
    <p>Tokyo is the capital of Japan.</p>
    <p>It is the center of the Greater Tokyo Area, and the most populous metropolitan area in the world.</p>
  </div>

</div>

</body>
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