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https://developer.mozilla.org/ja/docs/Web/CSS/Reference/Selectors/::slotted
::slotted() - CSS | MDN
::slotted() は CSS の擬似要素で、 HTML テンプレート内にあるスロットに配置された任意の要素を表します (詳しくはテンプレートとスロットの利用をご覧ください)。
slotted cssmdn
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:has-slotted
:has-slotted CSS pseudo-class - CSS | MDN
css pseudo classslottedmdn
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/::slotted
::slotted() CSS pseudo-element - CSS | MDN
The ::slotted() CSS pseudo-element represents any element that has been placed into a slot inside an HTML template (see Using templates and slots for more...
css pseudo elementslottedmdn