This explains a lot of CSS nonsense.Sadly it is also nonsense itself.
I always fight it with P elements.
The top and bottom margins of blocks are sometimes combined (collapsed) into a single margin whose size is the largest of the individual margins (or just one of them, if they are equal), a behavior known as margin collapsing. Note that the margins of floating and absolutely po...
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Box_... On MDN Web Docs
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