diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index ffaa78af45373..2117a0bac941a 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Parse `ActionView::TestCase#rendered` HTML content as `Nokogiri::XML::DocumentFragment` instead of `Nokogiri::XML::Document`
+
+    *Sean Doyle*
+
 *   Rename `ActionView::TestCase::Behavior::{Content,RenderedViewContent}`
 
     *Sean Doyle*
diff --git a/actionview/lib/action_view/test_case.rb b/actionview/lib/action_view/test_case.rb
index a5a026efbadad..74f5fd83234e2 100644
--- a/actionview/lib/action_view/test_case.rb
+++ b/actionview/lib/action_view/test_case.rb
@@ -202,7 +202,7 @@ def include_helper_modules!
 
         setup :setup_with_controller
 
-        register_parser :html, -> rendered { Rails::Dom::Testing.html_document.parse(rendered).root }
+        register_parser :html, -> rendered { Rails::Dom::Testing.html_document_fragment.parse(rendered) }
         register_parser :json, -> rendered { JSON.parse(rendered, object_class: ActiveSupport::HashWithIndifferentAccess) }
 
         ActiveSupport.run_load_hooks(:action_view_test_case, self)
diff --git a/actionview/test/template/test_case_test.rb b/actionview/test/template/test_case_test.rb
index 6e8ad38f8e16a..163ec700d2255 100644
--- a/actionview/test/template/test_case_test.rb
+++ b/actionview/test/template/test_case_test.rb
@@ -397,12 +397,13 @@ class RenderedViewContentTest < ActionView::TestCase
   end
 
   class HTMLParserTest < ActionView::TestCase
-    test "rendered.html is a Nokogiri::XML::Element" do
+    test "rendered.html is a Nokogiri::XML::DocumentFragment" do
       developer = DeveloperStruct.new("Eloy")
 
       render "developers/developer", developer: developer
 
-      assert_kind_of Nokogiri::XML::Element, rendered.html
+      assert_kind_of Nokogiri::XML::DocumentFragment, rendered.html
+      assert_equal rendered.to_s, rendered.html.to_s
       assert_equal developer.name, document_root_element.text
     end
 
@@ -425,6 +426,7 @@ class JSONParserTest < ActionView::TestCase
       render formats: :json, partial: "developers/developer", locals: { developer: developer }
 
       assert_kind_of ActiveSupport::HashWithIndifferentAccess, rendered.json
+      assert_equal rendered.to_s, rendered.json.to_json
       assert_equal developer.name, rendered.json[:name]
     end
   end