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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<select name="cars">
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<option value="volvo">Volvo</option>
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<option value="saab">Saab</option>
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<option value="fiat">Fiat</option>
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<option value="audi">Audi</option>
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</select>
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<br><br>
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<input type="submit">
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</form>
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</body>