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>
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First name:<br>
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<input type="text" name="firstname">
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<br>
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Last name:<br>
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<input type="text" name="lastname">
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</form>
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​
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<p>Note that the form itself is not visible.</p>
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​
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<p>Also note that the default width of a text field is 20 characters.</p>
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​
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</body>
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</html>
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​