Add separate span with error message for the current field

app/views/common/_error_base.html.erb

@@ -27,7 +27,7 @@ See doc/COPYRIGHT.rdoc for more details.
 
 ++#%>
 
-<div class="errorExplanation" id="errorExplanation" role="alert">
+<div class="errorExplanation" id="errorExplanation" tabindex="0" role="alert">
   <% if content_for?(:error_details) %>
     <h2><%= error_message %></h2>
     <%= content_for :error_details %>

config/locales/en.yml

@@ -453,6 +453,7 @@ en:
 
   errors:
     header_invalid_fields: "There were problems with the following fields:"
+    field_erroneous_label: "This field is invalid: %{full_errors}\nPlease enter a valid value"
 
   activity:
     created: "Created: %{title}"

lib/tabular_form_builder.rb

@@ -200,8 +200,15 @@ class TabularFormBuilder < ActionView::Helpers::FormBuilder
 
     label_options[:class] << 'form--label'
 
-    has_errors = @object.try(:errors) && @object.errors.include?(field)
+
-    label_options[:class] << ' -error' if has_errors
+    content = h(text)
+    if @object.try(:errors) && @object.errors.include?(field)
+      label_options[:class] << ' -error'
+      error_label = I18n.t('errors.field_erroneous_label',
+                           full_errors: @object.errors.full_messages_for(field).join(' '))
+       content << content_tag('span', error_label, class: 'hidden-for-sighted')
+    end
+
     label_options[:class] << ' -required' if options.delete(:required)
     label_options[:for] = if options[:for]
                             options[:for]
@@ -211,7 +218,7 @@ class TabularFormBuilder < ActionView::Helpers::FormBuilder
     label_options[:lang] = options[:lang]
     label_options.reject! do |_k, v| v.nil? end
 
-    @template.label(@object_name, field, h(text), label_options)
+    @template.label(@object_name, field, content, label_options)
   end
 
   def element_id(translation_form)

spec/lib/tabular_form_builder_spec.rb

@@ -599,12 +599,20 @@ JJ Abrams</textarea>
         context 'with erroneous field' do
           before do
             resource.errors.add(:name, :invalid)
+            resource.errors.add(:name, :inclusion)
           end
 
           it 'shows an appropriate error label' do
             expect(output).to have_selector 'label.-error',
                                             count: 1,
-                                            text: User.human_attribute_name(:name)
+                                            text: 'Name'
+          end
+
+          it 'contains a specific error as a hidden sub-label' do
+            expect(output).to have_selector 'label.-error span',
+                                            count: 1,
+                                            text: 'This field is invalid: Name is invalid. ' \
+                                                  'Name is not set to one of the allowed values.'
           end
         end
       end