图标提示是否是结构的或是内容的冲突。
The icon gives an indication of whether it is a structural or content conflict.
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.
慢慢将移动鼠标移过工具栏上的图标，工具提示会告诉你每个按钮的功能。
Move the cursor slowly over the ICONS, and a tooltip tells you what function each button performs.
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