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https://webref.ru/css/first-child
Псевдокласс :first-child | CSS | WebReference
Псевдокласс :first-child задаёт стилевое оформление для первого дочернего элемента в группе братских элементов.
first child csswebreference
https://css-tricks.com/almanac/pseudo-selectors/f/first-child/
:first-child | CSS-Tricks
Jan 28, 2025 - The :first-child selector allows you to target the first element immediately inside another element. It is defined in the CSS Selectors Level 3 spec as a
first child csstricks
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:first-child
:first-child CSS pseudo-class - CSS | MDN
The :first-child CSS pseudo-class represents the first element among a group of sibling elements.
first child csspseudo class mdn