kianj2 opened a new issue, #20196:
URL: https://github.com/apache/echarts/issues/20196

   ### Version
   
   5.5.1
   
   ### Link to Minimal Reproduction
   
   
https://echarts.apache.org/examples/en/editor.html?c=custom-profit&lang=ts&code=PYBwLglsB2AEC8sDeAoWsA2BTA5l6AJgFzIC-ANGrAB4CC1EAziUhVQJ71MtvqNYAnCFmawA2lXSp0M2NACGAWywkA5ACF5A2AGVBwxqsqz0YdiBWxVAIy1HJMgvLDySEkzLEBGAEzlYAOwAusYe4l4AbP6-IQ6yYj5-sF7BoR5iAMwADP4-AByxYeIALHn-EYVhYgCsUckAnEFxsE2yvDLSJgrKagDCAK6MYMCKuvoi9h5mFmoAxoPDipMmAvgEggCSYFiKJABm_dCzkDCwABQgWkqM_vIgEACUyM3oAG5asOwAavIY_VgIWB3CAAOnefywZx8DwA3C9YO9tEMtGBAcCQbNgMABAQzmJ0eD_mcsg9_N9fv8grD4YjYIwIAAvAGIdH0pkAQjx8PQZwJFMhXie8kYcn6imsgieAFpznyIcShSLoGKJQJSdzPj8IfCqUClSrBGIgnCirShuxsGj7iDzdgztT4aswP0BHBOkVppZVKtjssiowABZ3Szuoo0EjIgRgMRZSphz4RlxR7xxsMAdwgBDAAYjjKwMaCsAAVLAsiCAtU0mGA1gIDgA2Bc0yUxr2h4APTtmQ7EBB-miUOyTsmBk-Eg5eHD9BtsK2yxz-GkE0mGfofCY9YseHUNw5ZKp2TsEh-eHDYAYSAgY_NVewJwuNzw7x7yL-DIHzyv5JlZLVD_obwfx8OoYireJgLfJJEn_cQMiSWp_FSJ8ENgCIkhSVoTEw6cqCaJcgA
   
   ### Steps to Reproduce
   
   1. Hover "Custom Series" in legend. Notice how custom series overlaps the 
bar series
   2. Uncomment this code in render item return rect
   ```typescript
   //   emphasis: {
   //     z2: 0,
   //   },
   ```
   3. Hover "Custom Series" in legend. Notice how custom series does not 
overlap the bar series
   
   ### Current Behavior
   
   It is clear that `series-custom.renderItem.return_rect.emphasis.z2` provides 
a change in behavior. However, this is not explained anywhere in the 
documentation. In addition, when `z2` is described in the documentation it is 
not clear to me what it does. The documentation for 
`series-custom.renderItem.return_rect.z2` is:
   
   > Define the overlap relationship between graphic elements.
   
   It is unclear to me what this means. Perhaps this can be explained more. 
Overlap between what kinds of graphic elements? If I change the bar graph to a 
line in the linked example the custom series does not overlap the line series. 
So it appears that overlapping happens in specific contexts. In addition, does 
`z2` represent a z index of sorts? And when is `z2` taken into consideration? 
Only when elements overlap?
   
   ### Expected Behavior
   
   `series-custom.renderItem.return_rect.emphasis.z2` is properly documented.
   
   ### Environment
   
   ```markdown
   - OS:
   - Browser:
   - Framework:
   ```
   
   
   ### Any additional comments?
   
   `series-custom.renderItem.return_rect.emphasis.z2` ended up being a solution 
to a problem I was experiencing where adding emphasis on custom series resulted 
in bar series being covered. This only happened when bar series were placed 
before custom series in the series list. Because 
`series-custom.renderItem.return_rect.emphasis.z2` seems to have solved my 
problems, I wanted to know more about it to make sure it was the right solution.


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