CSS: Mastering Margin Collapsing(developer.mozilla.org)
developer.mozilla.org
CSS: Mastering Margin Collapsing
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Box_model/Margin_collapsing
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https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Box_model/Margin_collapsing
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