Новоe CSS-свойство margin-trim
Оно позволяет автоматически обрезать внешние отступы своих дочерних элементов, примыкающих к его краям. Это упрощает создание макетов без необходимости вручную удалять отступы у первого и последнего дочерних элементов. Поддерживается пока только в Safari.
https://webkit.org/blog/16854/margin-trim/
BY FrontEndDev
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FrontEndDev from tr