代码编辑器:
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<meta charset="utf-8">
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<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
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<style>
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div
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{
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width:350px;
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height:100px;
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border:1px solid black;
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/* Internet Explorer 10 */
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display:flexbox;
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flex-pack:center;
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flex-align:center;
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/* Firefox */
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display:box;
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box-pack:center;