From 545befc2d6ea1324557450578bef6354996dc93e Mon Sep 17 00:00:00 2001
From: Jonathan Magnan <info@zzzprojects.com>
Date: Wed, 23 Aug 2023 10:09:48 -0400
Subject: [PATCH] Update HtmlNode.cs

---
 src/HtmlAgilityPack.Shared/HtmlNode.cs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/HtmlAgilityPack.Shared/HtmlNode.cs b/src/HtmlAgilityPack.Shared/HtmlNode.cs
index 9ac347c..b4dfce7 100644
--- a/src/HtmlAgilityPack.Shared/HtmlNode.cs
+++ b/src/HtmlAgilityPack.Shared/HtmlNode.cs
@@ -979,6 +979,21 @@ public HtmlNode AppendChild(HtmlNode newChild)
 			_ownerdocument.SetIdForNode(newChild, newChild.GetId());
 			SetChildNodesId(newChild);
 
+			var parentnode = _parentnode;
+			HtmlDocument lastOwnerDocument = null;
+			while (parentnode != null) 
+			{
+				if(parentnode.OwnerDocument != lastOwnerDocument)
+                {
+					parentnode.OwnerDocument.SetIdForNode(newChild, newChild.GetId());
+					parentnode.SetChildNodesId(newChild);
+					lastOwnerDocument = parentnode.OwnerDocument;
+				}
+
+				parentnode = parentnode._parentnode;
+			}
+
+
 			SetChanged();
 			return newChild;
 		}