adds in aria attributes and semantic status content for choicegroup problems

common/lib/capa/capa/templates/choicegroup.html

@@ -3,7 +3,7 @@
     % if input_type == 'checkbox' or not value:
         % if status == 'unsubmitted' or show_correctness == 'never':
         <span class="unanswered" style="display:inline-block;" id="status_${id}"></span>
-        % elif status == 'correct': 
+        % elif status == 'correct':
         <span class="correct" id="status_${id}"></span>
         % elif status == 'incorrect':
         <span class="incorrect" id="status_${id}"></span>
@@ -18,7 +18,7 @@
         % for choice_id, choice_description in choices:
         <label for="input_${id}_${choice_id}"
             % if input_type == 'radio' and ( (isinstance(value, basestring) and (choice_id == value))  or  (not isinstance(value, basestring) and choice_id in value) ):
-            <% 
+            <%
                 if status == 'correct':
                     correctness = 'correct'
                 elif status == 'incorrect':
@@ -28,12 +28,13 @@
             %>
             % if correctness and not show_correctness=='never':
             class="choicegroup_${correctness}"
+            <span class="sr" aria-describedby="input_${id}_${choice_id}">Status: ${correctness}</span>
             % endif
             % endif
             >
-            <input type="${input_type}" name="input_${id}${name_array_suffix}" id="input_${id}_${choice_id}" value="${choice_id}"
+            <input type="${input_type}" name="input_${id}${name_array_suffix}" id="input_${id}_${choice_id}" aria-describedby="answer_${id}" value="${choice_id}"
             % if input_type == 'radio' and ( (isinstance(value, basestring) and (choice_id == value))  or  (not isinstance(value, basestring) and choice_id in value) ):
-            checked="true" 
+            checked="true"
             % elif input_type != 'radio' and choice_id in value:
             checked="true"
             % endif