Alternative fix for popup accessibility.

drag_and_drop_v2/public/js/drag_and_drop.js

@@ -237,11 +237,18 @@ function DragNDropTemplates(url_name) {
                         'div.item-bank',
                         renderCollection(itemTemplate, items_in_bank, ctx)
                     ),
-                    h('div.target', [
+                    h('div.target',
+                        {
+                            attributes: {
+                                'aria-live': 'polite',
+                                'aria-atomic': 'true',
+                                'aria-relevant': 'additions',
+                            },
+                        },
+                        [
                             h(
                                 popupSelector,
                                 {
-                                attributes: {'aria-live': 'polite'},
                                     style: {display: ctx.popup_html ? 'block' : 'none'},
                                 },
                                 [
@@ -251,10 +258,12 @@ function DragNDropTemplates(url_name) {
                             ),
                             h('div.target-img-wrapper', [
                                 h('img.target-img', {src: ctx.target_img_src, alt: ctx.target_img_description}),
-                        ]),
+                            ]
+                        ),
                         renderCollection(zoneTemplate, ctx.zones, ctx),
                         renderCollection(itemTemplate, items_placed, ctx),
-                    ]),
+                    ]
+                    ),
                 ]),
                 keyboardHelpTemplate(ctx),
                 feedbackTemplate(ctx),