How to modify the title style of html tag with css? (code example)

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Pure CSS to implement tooltip, css changes the title style of the html tag [The author will update when he has time Some boundary conditions. The current style is problematic in extreme cases. Please do not copy the code directly to the online environment. This is just a small demo written by the author]

html code:

The following code is available directly, and the style of tootip can be debugged by yourself.

      
  
 我是主体内容啊 
  

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