W3Schools 试用编辑器 - W3Schools 中文教程

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.header {
  border: 1px solid red;
  padding: 15px;
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.row::after {
  content: "";
  clear: both;
  display: table;
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  float: left;
  padding: 15px;
  border: 1px solid red;
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<div class="header">
  <h1>Chania</h1>
</div>

<div class="col-3">
  <ul>
    <li>The Flight</li>
    <li>The City</li>
    <li>The Island</li>
    <li>The Food</li>
  </ul>
</div>

<div class="col-9">
  <h1>The City</h1>
  <p>Chania is the capital of the Chania region on the island of Crete. The city can be divided in two parts, the old town and the modern city.</p>
  <p>Resize the browser window to see how the content respond to the resizing.</p>
</div>

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