[VarDumper] Use documentElement instead of body for JS flag

ohader · ohader · commit 36579a1133f4 · 2023-05-31T10:56:50.000+02:00
Using `document.documentElement` allows to use the dumper
outside of a `&lt;html&gt;&lt;body&gt;...&lt;/body&gt;&lt;/html&gt;` scenario.

Fixes: #50487
diff --git a/Dumper/HtmlDumper.php b/Dumper/HtmlDumper.php
@@ -163,9 +163,7 @@ protected function getDumpHeader()
 <script>
 Sfdump = window.Sfdump || (function (doc) {
 
-if (doc.body instanceof HTMLElement) {
-    doc.body.classList.add('sf-js-enabled');
-}
+doc.documentElement.classList.add('sf-js-enabled');
 
 var rxEsc = /([.*+?^${}()|\[\]\/\\])/g,
     idRx = /\bsf-dump-\d+-ref[012]\w+\b/,
