案例:html5案例     状态:可编辑再运行    进入竖版
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<!DOCTYPE HTML>
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<html>
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<body>
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<form action="/example/html/form_action.aspx" method="get">
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Username: <input type="text" name="usr_name" />
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Encryption: <keygen name="security" />
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<input type="submit" />
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</form>
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</body>
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</html>