Issue #1106344 by mgifford, BarisW: Taxonomy term reference field headers always should be rendered with a HTML header (invisible or not).

core/modules/field/field.module

@@ -630,7 +630,7 @@ function template_preprocess_field(&$variables, $hook) {
   // label, it needs to supply a preprocess function that sets it to the
   // sanitized element title or whatever else is wanted in its place.
   $variables['label_hidden'] = ($element['#label_display'] == 'hidden');
-  $variables['label'] = $variables['label_hidden'] ? NULL : check_plain($element['#title']);
+  $variables['label'] = check_plain($element['#title']);
 
   // We want other preprocess functions and the theme implementation to have
   // fast access to the field item render arrays. The item render array keys

core/themes/bartik/bartik.theme

@@ -178,10 +178,9 @@ function bartik_menu_tree__shortcut_default($variables) {
 function bartik_field__taxonomy_term_reference($variables) {
   $output = '';
 
-  // Render the label, if it's not hidden.
-  if (!$variables['label_hidden']) {
-    $output .= '<h3 class="field-label">' . $variables['label'] . ': </h3>';
-  }
+  // Render the label either as a visible list or make it visually hidden for accessibility.
+  $hidden_class = empty($variables['label_hidden']) ? '' : ' visually-hidden';
+  $output .= '<h3 class="field-label' . $hidden_class . '">' . $variables['label'] . ': </h3>';
 
   // Render the items.
   $output .= ($variables['element']['#label_display'] == 'inline') ? '<ul class="links inline">' : '<ul class="links">';