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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  Telephone:
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  <input type="tel" name="usrtel">
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  <input type="submit">
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</form>
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​
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<p><b>Note:</b> type="tel" is supported only in Safari 8.</p>
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​
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</body>
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</html>