案例:html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">
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<input type="radio" name="sex" value="male" checked>Male
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<br>
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<input type="radio" name="sex" value="female">Female
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<br><br>
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<input type="submit">
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</form> 
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</body>
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</html>