1 files changed, 14 insertions, 0 deletions
diff --git a/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue b/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue
index 3d20dfd0c9b..96946d0fd88 100644
--- a/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue
+++ b/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue
@@ -3,6 +3,10 @@ import { GlTooltipDirective, GlIcon, GlSafeHtmlDirective as SafeHtml } from '@gi
 import $ from 'jquery';
 import { mapActions, mapGetters, mapState } from 'vuex';
 import { CONTEXT_LINE_CLASS_NAME, PARALLEL_DIFF_VIEW_TYPE } from '../constants';
+import {
+  getInteropOldSideAttributes,
+  getInteropNewSideAttributes,
+} from '../utils/interoperability';
 import DiffGutterAvatars from './diff_gutter_avatars.vue';
 import * as utils from './diff_row_utils';
 
@@ -108,6 +112,12 @@ export default {
         this.line.hasDiscussionsRight,
       );
     },
+    interopLeftAttributes() {
+      return getInteropOldSideAttributes(this.line.left);
+    },
+    interopRightAttributes() {
+      return getInteropNewSideAttributes(this.line.right);
+    },
   },
   mounted() {
     this.scrollToLineIfNeededParallel(this.line);
@@ -185,6 +195,7 @@ export default {
             type="button"
             class="add-diff-note note-button js-add-diff-note-button qa-diff-comment"
             :disabled="line.left.commentsDisabled"
+            :aria-label="addCommentTooltipLeft"
             @click="handleCommentButton(line.left)"
           >
             <gl-icon :size="12" name="comment" />
@@ -217,6 +228,7 @@ export default {
         :key="line.left.line_code"
         v-safe-html="line.left.rich_text"
         :class="parallelViewLeftLineType"
+        v-bind="interopLeftAttributes"
         class="line_content with-coverage parallel left-side"
         @mousedown="handleParallelLineMouseDown"
       ></td>
@@ -241,6 +253,7 @@ export default {
             type="button"
             class="add-diff-note note-button js-add-diff-note-button qa-diff-comment"
             :disabled="line.right.commentsDisabled"
+            :aria-label="addCommentTooltipRight"
             @click="handleCommentButton(line.right)"
           >
             <gl-icon :size="12" name="comment" />
@@ -283,6 +296,7 @@ export default {
             hll: isHighlighted,
           },
         ]"
+        v-bind="interopRightAttributes"
         class="line_content with-coverage parallel right-side"
         @mousedown="handleParallelLineMouseDown"
       ></td>