Whether the background of the div is transparent or whether the background of the div is transparent

Whether the background of the div is transparent or whether the background of the div is transparent

Whether the background of the div is transparent:
Suggestion: writing code as much as possible can effectively improve learning efficiency and depth.
This problem is simple, but it may be unfamiliar to beginners. For example, some beginners may think that the background color of the div is white, because sometimes it looks like this. Here is an example to prove whether this is the case. The Code is as follows:

 

<! DOCTYPE html>  
 
 
The above Code shows that the background of the div is transparent.
 
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