案例：html案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<form action="/example/html/form_action.aspx">
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First name:<br>
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<input type="text" name="firstname" value="Mickey">
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<br>
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Last name:<br>
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<input type="text" name="lastname" value="Mouse">
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<br><br>
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<input type="submit">
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</form>
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​
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</body>
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</html>