kenarp opened a new issue, #19287:
URL: https://github.com/apache/echarts/issues/19287

   ### What problem does this feature solve?
   
   Tooltip triggered by a data item can set its own border-color based on that 
data by default, but tooltip triggered by the AxisPointer doesn't have this 
feature, which breaks the uniformity of design.
   
   - With borderColor:
   
![image](https://github.com/apache/echarts/assets/43948403/ebfb8654-d7b8-4779-b974-5fcba5a0fb81)
   
   - Without borderColor:
   
![image](https://github.com/apache/echarts/assets/43948403/80ffccae-bffa-4bcb-b083-a509046a9052)
   
   
   ### What does the proposed API look like?
   
   Provide an attribute to set the tooltip style manully, which accepts a 
callback function as value, just like the implementation of tooltip.position 
and tooltip.formatter
   
   ``` js
   const  option={
   ...otherOptions,
   tooltip:{
       trigger: "axis",
       position: tooltipPositionCallback,
       formatter: tooltipFormatterCallback,
       itemStyle: tooltipStyleCallback
   }
   
   function tooltipStyleCallback(params){
   const myColor = myColorPalette[params.dataIndex]
   return {borderColor:myrColor, borderWidth:"3px"}
   }
   ```


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