Only add required if browser_validations is enabled.

lib/simple_form/components/html5.rb

@@ -16,7 +16,10 @@ module SimpleForm
       end
 
       def has_required?
-        required_field?
+        # We need to check browser_validations because
+        # some browsers are still checking required even
+        # if novalidate was given.
+        required_field? && SimpleForm.browser_validations
       end
     end
   end

test/inputs/collection_input_test.rb

@@ -249,6 +249,14 @@ class CollectionInputTest < ActionView::TestCase
     assert_select 'select[required]'
   end
 
+  test 'when not using browser validations, input should not generate required html attribute' do
+    swap SimpleForm, :browser_validations => false do
+      with_input_for @user, :name, :string
+      assert_select 'input[type=text].required'
+      assert_no_select 'input[type=text][required]'
+    end
+  end
+
   test 'collection input with select type should not generate required html attribute without blank option' do
     with_input_for @user, :name, :select, :include_blank => false, :collection => ['Jose' , 'Carlos']
     assert_select 'select.required'