代码编辑器：
x
1
2
<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 4
<style> 5
[class*="test"]6
{7
background:#ffff00;8
}9
</style>10
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<div class="first_test">The first div element.</div>12
<div class="second">The second div element.</div>13
<div class="test">The third div element.</div>14
<p class="test">This is some text in a paragraph.</div>15
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<footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>17