diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index b74b36c439286..a57da72d8c9d4 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,9 @@
+*   Use `display:none` instead of `display:inline` for hidden fields
+
+    Fixes #6403
+
+    *Gaelian Ditchburn*
+
 *   The `video_tag` helper accepts a number as `:size`
 
     The `:size` option of the `video_tag` helper now can be specified
diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index b6b00df0a0187..5235962f9f367 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -51,7 +51,7 @@ module Helpers
     # The HTML generated for this would be (modulus formatting):
     #
     #   <form action="/people" class="new_person" id="new_person" method="post">
-    #     <div style="margin:0;padding:0;display:inline">
+    #     <div style="display:none">
     #       <input name="authenticity_token" type="hidden" value="NrOp5bsjoLRuK8IW5+dQEYjKGUJDe7TQoZVvq95Wteg=" />
     #     </div>
     #     <label for="person_first_name">First name</label>:
@@ -81,7 +81,7 @@ module Helpers
     # the code above as is would yield instead:
     #
     #   <form action="/people/256" class="edit_person" id="edit_person_256" method="post">
-    #     <div style="margin:0;padding:0;display:inline">
+    #     <div style="display:none">
     #       <input name="_method" type="hidden" value="patch" />
     #       <input name="authenticity_token" type="hidden" value="NrOp5bsjoLRuK8IW5+dQEYjKGUJDe7TQoZVvq95Wteg=" />
     #     </div>
@@ -315,7 +315,7 @@ module FormHelper
       # The HTML generated for this would be:
       #
       #   <form action='http://www.example.com' method='post' data-remote='true'>
-      #     <div style='margin:0;padding:0;display:inline'>
+      #     <div style='display:none'>
       #       <input name='_method' type='hidden' value='patch' />
       #     </div>
       #     ...
@@ -333,7 +333,7 @@ module FormHelper
       # The HTML generated for this would be:
       #
       #   <form action='http://www.example.com' method='post' data-behavior='autosave' name='go'>
-      #     <div style='margin:0;padding:0;display:inline'>
+      #     <div style='display:none'>
       #       <input name='_method' type='hidden' value='patch' />
       #     </div>
       #     ...
diff --git a/actionview/lib/action_view/helpers/form_tag_helper.rb b/actionview/lib/action_view/helpers/form_tag_helper.rb
index 7ceb56625fea5..80f066b3bebc4 100644
--- a/actionview/lib/action_view/helpers/form_tag_helper.rb
+++ b/actionview/lib/action_view/helpers/form_tag_helper.rb
@@ -722,7 +722,7 @@ def extra_tags_for_form(html_options)
 
           enforce_utf8 = html_options.delete("enforce_utf8") { true }
           tags = (enforce_utf8 ? utf8_enforcer_tag : ''.html_safe) << method_tag
-          content_tag(:div, tags, :style => 'margin:0;padding:0;display:inline')
+          content_tag(:div, tags, :style => 'display:none')
         end
 
         def form_tag_html(html_options)
diff --git a/actionview/test/activerecord/form_helper_activerecord_test.rb b/actionview/test/activerecord/form_helper_activerecord_test.rb
index 2e302c65a7269..0a9628da8d156 100644
--- a/actionview/test/activerecord/form_helper_activerecord_test.rb
+++ b/actionview/test/activerecord/form_helper_activerecord_test.rb
@@ -59,7 +59,7 @@ def test_nested_fields_for_with_child_index_option_override_on_a_nested_attribut
   protected
 
   def hidden_fields(method = nil)
-    txt =  %{<div style="margin:0;padding:0;display:inline">}
+    txt =  %{<div style="display:none">}
     txt << %{<input name="utf8" type="hidden" value="&#x2713;" />}
     if method && !%w(get post).include?(method.to_s)
       txt << %{<input name="_method" type="hidden" value="#{method}" />}
diff --git a/actionview/test/template/form_helper_test.rb b/actionview/test/template/form_helper_test.rb
index 90f7a412fbb04..fe82349265924 100644
--- a/actionview/test/template/form_helper_test.rb
+++ b/actionview/test/template/form_helper_test.rb
@@ -3023,7 +3023,7 @@ def test_form_for_only_instantiates_builder_once
   protected
 
   def hidden_fields(method = nil)
-    txt =  %{<div style="margin:0;padding:0;display:inline">}
+    txt =  %{<div style="display:none">}
     txt << %{<input name="utf8" type="hidden" value="&#x2713;" />}
     if method && !%w(get post).include?(method.to_s)
       txt << %{<input name="_method" type="hidden" value="#{method}" />}
diff --git a/actionview/test/template/form_tag_helper_test.rb b/actionview/test/template/form_tag_helper_test.rb
index 22bf438a56423..0d5831dc6f134 100644
--- a/actionview/test/template/form_tag_helper_test.rb
+++ b/actionview/test/template/form_tag_helper_test.rb
@@ -14,7 +14,7 @@ def hidden_fields(options = {})
     method = options[:method]
     enforce_utf8 = options.fetch(:enforce_utf8, true)
 
-    txt =  %{<div style="margin:0;padding:0;display:inline">}
+    txt =  %{<div style="display:none">}
     txt << %{<input name="utf8" type="hidden" value="&#x2713;" />} if enforce_utf8
     if method && !%w(get post).include?(method.to_s)
       txt << %{<input name="_method" type="hidden" value="#{method}" />}