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创建响应式设计的一个方法，是自己来创建它：
<!DOCTYPE html><html lang="en-US"><head><style>.city {float: left;margin: 5px;padding: 15px;width: 300px;height: 300px;border: 1px solid black;} </style></head><body><h1>W3School Demo</h1><h2>Resize this responsive page!</h2><br><div class="city"><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 class="city"><h2>Paris</h2><p>Paris is the capital and most populous city of France.</p></div><div class="city"><h2>Tokyo</h2><p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,and the most populous metropolitan area in the world.</p></div></body></html>另一个创建响应式设计的方法，是使用现成的 CSS 框架。
Bootstrap 是最流行的开发响应式 web 的 HTML, CSS, 和 JS 框架。
Bootstrap 帮助您开发在任何尺寸都外观出众的站点：显示器、笔记本电脑、平板电脑或手机：
<!DOCTYPE html><html><head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css"></head><body><div class="container"><div class="jumbotron"> <h1>W3School Demo</h1> <p>Resize this responsive page!</p> </div></div><div class="container"><div class="row"> <div class="col-md-4"> <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 class="col-md-4"> <h2>Paris</h2> <p>Paris is the capital and most populous city of France.</p> </div> <div class="col-md-4"> <h2>Tokyo</h2> <p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the most populous metropolitan area in the world.</p> </div></div></div></body></html>
如需学习更多有关 Bootstrap 的知识，请阅读我们的 Bootstrap 教程。