MDL-47494 ddimageortext: Merge remote-tracking branch 'jp/MOODLE_21_STABLE' into MOODLE_21_STABLE

question/type/ddimageortext/lang/en/qtype_ddimageortext.php

@@ -36,6 +36,7 @@ $string['draggableitem'] = 'Draggable item';
 $string['draggableitemheader'] = 'Draggable item {$a}';
 $string['draggableitemtype'] = 'Type';
 $string['draggableword'] = 'Draggable text';
+$string['dropbackground'] = 'Background image for dragging markers onto';
 $string['dropzone'] = 'Drop zone {$a}';
 $string['dropzoneheader'] = 'Drop zones';
 $string['editingddimageortext'] = 'Editing drag and drop onto image';

question/type/ddimageortext/rendererbase.php

@@ -64,7 +64,11 @@ class qtype_ddtoimage_renderer_base extends qtype_with_combined_feedback_rendere
 
         $bgimage = self::get_url_for_image($qa, 'bgimage');
 
-        $img = html_writer::empty_tag('img', array('src'=>$bgimage, 'class'=>'dropbackground'));
+        $img = html_writer::empty_tag('img',
+                                array('src'=>$bgimage,
+                                    'class'=>'dropbackground',
+                                    'alt' => get_string('dropbackground', 'qtype_ddimageortext')));
+
         $droparea = html_writer::tag('div', $img, array('class'=>'droparea'));
 
         $dragimagehomes = '';