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How does a border and padding prevent margins from collapsing from a parent/first-child relationship?
Is it that applying a border to the parent sets a context for the child to add margin? Is it as simple as the border separates the two?
I’m looking for a more CSS technical answer, if any, as to why this is?
Probaly easier to read the spec of you want a technical answer.
https://www.w3.org/TR/CSS21/box.html#collapsing-margins