Javascript: Scroll to cursor post a paste in contenteditable div

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I have a div with contenteditable attribute value set to true. When I paste some text in this contenteditable, I am able to keep the mouse position at the end of the pasted text. When there is a large amount of text pasted, the text may overflow the visible area. Note that width if fixed and the element scrolls in the Y direction.

I am unable to figure how to determine the cursor (not the mouse) Y position post the paste so that I can scroll to that position. It is not necessarily true that the paste will always happen at the end, so scroll to bottom is not going to help out in all cases.

Any hints on this will be appreciated.

html javascript
1 Answers
const scrollSelectionIntoView = () => {
  // Get current selection
  const selection = window.getSelection();

  // Check if there are selection ranges
  if (!selection.rangeCount) {
    return;
  }

  // Get the first selection range. There's almost never can be more (instead of firefox)
  const firstRange = selection.getRangeAt(0);

  // Sometimes if the editable element is getting removed from the dom you may get a HierarchyRequest error in safari
  if (firstRange.commonAncestorContainer === document) {
    return;
  }

  // Create an empty br that will be used as an anchor for scroll, because it's imposible to do it with just text nodes
  const tempAnchorEl = document.createElement('br');

  // Put the br right after the caret position
  firstRange.insertNode(tempAnchorEl);

  // Scroll to the br. I personally prefer to add the block end option, but if you want to use 'start' instead just replace br to span
  tempAnchorEl.scrollIntoView({
    block: 'end',
  });

  // Remove the anchor because it's not needed anymore
  tempAnchorEl.remove();
};
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