代码编辑器:
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<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
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<style>
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div {color: red; }
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</style>
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<div>
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<h1 id="bc">Hello World</h1>
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<ul>
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<li id="a">Item one</li>
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<li id="b">Item two</li>
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<li id="c">Item three</li>
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</ul>
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</div>
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<p>点击“尝试一下”按钮把第二个列表项的 color 属性的值设置为 "initial":</p>