How to implement Html event bubbling

I originally thought that span was different from input, and event bubbling would be swallowed up by the parent tag. I wrote a demo to test event bubbling, but found that it was not what I thought. In addition: event.stopPropagation() and event.stopImmediatePropagation() cannot prevent span from bubbling into the a tag, but the simple and crudereturn falsecan.

      
  
 span tag in div 
 
 
  in div 
 
  span tag in anchor  
  span tag in anchor   

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