From 45a4aaf7e0e6586e45d8da0bcc88b9ec8f539967 Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sun, 5 Jan 2020 12:26:22 -0500
Subject: Bug 1398401 - Add preference check for custom element setup.

Tag UXP Issue #1344
---
 parser/html/nsHtml5TreeOperation.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'parser/html/nsHtml5TreeOperation.cpp')

diff --git a/parser/html/nsHtml5TreeOperation.cpp b/parser/html/nsHtml5TreeOperation.cpp
index 3877e01b8..57835bd36 100644
--- a/parser/html/nsHtml5TreeOperation.cpp
+++ b/parser/html/nsHtml5TreeOperation.cpp
@@ -439,7 +439,9 @@ nsHtml5TreeOperation::CreateElement(int32_t aNs,
                           false);
 
       // Custom element setup may be needed if there is an "is" attribute.
-      if (kNameSpaceID_None == nsuri && !prefix && nsGkAtoms::is == localName) {
+        if (nsContentUtils::IsWebComponentsEnabled() &&
+            kNameSpaceID_None == nsuri &&
+            !prefix && nsGkAtoms::is == localName) {
         nsContentUtils::SetupCustomElement(newContent, &value);
       }
     }
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