From 7ccfe809aed31b779afb82c1e523b0e72e08b420 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20Lyngs=C3=B8?= <nsl@umbraco.dk>
Date: Thu, 21 Nov 2019 12:09:46 +0100
Subject: [PATCH] Do not check style of DocumentFragment.

(cherry picked from commit 3b7d5995e4cdeab56265114416e7ea17b8ca7cbd)
---
 .../src/common/services/tabbable.service.js               | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Umbraco.Web.UI.Client/src/common/services/tabbable.service.js b/src/Umbraco.Web.UI.Client/src/common/services/tabbable.service.js
index 3782128af6..2f7af50804 100644
--- a/src/Umbraco.Web.UI.Client/src/common/services/tabbable.service.js
+++ b/src/Umbraco.Web.UI.Client/src/common/services/tabbable.service.js
@@ -184,7 +184,13 @@
               });
               if (cached) return cached[1];
 
-              nodeComputedStyle = nodeComputedStyle || this.doc.defaultView.getComputedStyle(node);
+              if (!nodeComputedStyle) {
+                if (node instanceof DocumentFragment) {
+                  return false;
+                } else {
+                  nodeComputedStyle = this.doc.defaultView.getComputedStyle(node);
+                }
+              }
 
               var result = false;