代码编辑器:
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
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<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
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<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
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<style>body {margin:20px}</style>
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<h1>我是标题1 h1. <small>我是副标题1 h1</small></h1>
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<h2>我是标题2 h2. <small>我是副标题2 h2</small></h2>
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<h3>我是标题3 h3. <small>我是副标题3 h3</small></h3>
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<h4>我是标题4 h4. <small>我是副标题4 h4</small></h4>
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<h5>我是标题5 h5. <small>我是副标题5 h5</small></h5>
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<h6>我是标题6 h6. <small>我是副标题6 h6</small></h6>
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