在文本字段中输入文字并按return键。

Just enter text in the text field at the top and press Return.

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最后输入一个无效数字，比如文本文字test，再次单击Validate，字段再次突出显示，图标提示框将出现消息Not a valid number。

Finally, enter an invalid number such as the text test and press Validate once more. The field will highlight once more and the icon tooltip will reveal the message Not a valid number.

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