From 19add9703a0beab5e8b326b7a01bb67e9291ae56 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Mon, 16 Jan 2023 11:52:33 +0100
Subject: [PATCH] [VarDumper] Fix JS to expand / collapse

---
 src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
index af4de9613656d..75cbe2fcbf6e6 100644
--- a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
@@ -167,9 +167,9 @@ protected function getDumpHeader()
     };
 
 refStyle.innerHTML = 'pre.sf-dump .sf-dump-compact, .sf-dump-str-collapse .sf-dump-str-collapse, .sf-dump-str-expand .sf-dump-str-expand { display: none; }';
-(doc.documentElement.firstElementChild || doc.documentElement.children[0]).appendChild(refStyle);
+doc.head.appendChild(refStyle);
 refStyle = doc.createElement('style');
-(doc.documentElement.firstElementChild || doc.documentElement.children[0]).appendChild(refStyle);
+doc.head.appendChild(refStyle);
 
 if (!doc.addEventListener) {
     addEventListener = function (element, eventName, callback) {