::backdropThe ::backdrop CSS pseudo-element is a box underneath an element in the top layer, such as a <dialog>. It can be used to create obscuring effects distinguishing a modal element from the elements underneath.selectorsSelectorswidely2022-03-142024-09-14https://drafts.csswg.org/css-position-4/#backdrophttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/::backdropcss.selectors.backdropcss.selectors.backdrop.dialogcss.selectors.backdrop.inherit_from_originating_elementhttps://nowyoucanuse.com/features--backdrop.html