offset property
      
      int
      get
      offset
      
    
    
Offset in characters of this node relative to parent node.
To get offset of this node in the document see documentOffset.
Implementation
int get offset {
  var offset = 0;
  if (list == null || isFirst) {
    return offset;
  }
  var cur = this;
  do {
    cur = cur.previous!;
    offset += cur.length;
  } while (!cur.isFirst);
  return offset;
}