LibWeb: Preserve comments in XML documents

Author: https://github.com/ADKaster
Commit: f9f854b493
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5512
Reviewed-by: https://github.com/alimpfard ✅

Libraries/LibWeb/DOM/DocumentLoading.cpp

@@ -178,7 +178,7 @@ static WebIDL::ExceptionOr<GC::Ref<DOM::Document>> load_xml_document(HTML::Navig
             document->completely_finish_loading();
             return;
         }
-        XML::Parser parser(source.value(), { .resolve_external_resource = resolve_xml_resource });
+        XML::Parser parser(source.value(), { .preserve_cdata = true, .preserve_comments = true, .resolve_external_resource = resolve_xml_resource });
         XMLDocumentBuilder builder { document };
         auto result = parser.parse_with_listener(builder);
         if (result.is_error()) {