The read-only endContainer property of the AbstractRange interface returns the Node in which the end of the range is located.
To change the end position, use the Range.setEnd() method or a similar one.
The Node which contains the last character of the range.
const range = document.createRange();
range.setStart(startNode, startOffset);
range.setEnd(endNode, endOffset);
const endRangeNode = range.endContainer;