Selection composed rangesThe window.getSelection().getComposedRanges() method returns ranges that represent the current user selection, even if the selection spans across shadow tree boundaries.selectionSelectionnewly2025-08-19https://w3c.github.io/selection-api/#dom-selection-getcomposedrangeshttps://developer.mozilla.org/docs/Web/API/Selection/getComposedRangesapi.Selection.getComposedRangeshttps://nowyoucanuse.com/features--composed-ranges.html