seaheart commented on issue #21083:
URL: https://github.com/apache/echarts/issues/21083#issuecomment-3036801121

   Thanks for your reply. There has no leaks log found when I used 
FinalizationRegistry to check tooltipHTMLContent, dispose function called 
expectly, but meantime the chrome memory still detected tooltipHTMLContent 
instance detached from dom nodes. so there might be other places referencing el 
and causing it not to be released, such as 
DocumentCachedAccessor、IntersectionObserver.
   
   Once I added the event listener removal, the tooltipHTMLContent instances 
stopped showing up in detached memory.


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