From e4bb670114d10347a856608e6e71f1b93548b163 Mon Sep 17 00:00:00 2001
From: edave64 <github5815@xcvbnm.org>
Date: Thu, 18 Jul 2024 14:36:34 +0200
Subject: [PATCH] Handle contained by checks in documents other than the
 primary document

---
 src/blot/abstract/parent.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/blot/abstract/parent.ts b/src/blot/abstract/parent.ts
index 2b1c5fd..c8ea687 100644
--- a/src/blot/abstract/parent.ts
+++ b/src/blot/abstract/parent.ts
@@ -351,7 +351,7 @@ class ParentBlot extends ShadowBlot implements Parent {
         node.parentNode != null &&
         // @ts-expect-error Fix me later
         node.tagName !== 'IFRAME' &&
-        document.body.compareDocumentPosition(node) &
+        (node.ownerDocument ?? document).body.compareDocumentPosition(node) &
           Node.DOCUMENT_POSITION_CONTAINED_BY
       ) {
         return;