adds in aria attributes and semantic status content for drag and drop problems

common/lib/capa/capa/templates/drag_and_drop_input.html

@@ -19,10 +19,10 @@
     % endif
 
 
-    <input type="text" name="input_${id}" id="input_${id}" value="${value|h}"
+    <input type="text" name="input_${id}" id="input_${id}" aria-describedby="answer_${id}" value="${value|h}"
     style="display:none;"/>
 
-    <p class="status">
+    <p class="status" aria-describedby="input_${id}">
         % if status == 'unsubmitted':
         unanswered
         % elif status == 'correct':