diff --git a/src/applications/differential/render/DifferentialChangesetHTMLRenderer.php b/src/applications/differential/render/DifferentialChangesetHTMLRenderer.php
--- a/src/applications/differential/render/DifferentialChangesetHTMLRenderer.php
+++ b/src/applications/differential/render/DifferentialChangesetHTMLRenderer.php
@@ -425,13 +425,6 @@
       ));
   }
 
-  protected function renderInlineComment(
-    PhabricatorInlineCommentInterface $comment,
-    $on_right = false) {
-
-    return $this->buildInlineComment($comment, $on_right)->render();
-  }
-
   protected function buildInlineComment(
     PhabricatorInlineCommentInterface $comment,
     $on_right = false) {
diff --git a/src/applications/differential/render/DifferentialChangesetTwoUpRenderer.php b/src/applications/differential/render/DifferentialChangesetTwoUpRenderer.php
--- a/src/applications/differential/render/DifferentialChangesetTwoUpRenderer.php
+++ b/src/applications/differential/render/DifferentialChangesetTwoUpRenderer.php
@@ -264,39 +264,33 @@
 
       if ($o_num && isset($old_comments[$o_num])) {
         foreach ($old_comments[$o_num] as $comment) {
-          $comment_html = $this->renderInlineComment($comment,
-                                                     $on_right = false);
-          $new = '';
+          $inline = $this->buildInlineComment(
+            $comment,
+            $on_right = false);
+          $scaffold = $this->getRowScaffoldForInline($inline);
+
           if ($n_num && isset($new_comments[$n_num])) {
             foreach ($new_comments[$n_num] as $key => $new_comment) {
               if ($comment->isCompatible($new_comment)) {
-                $new = $this->renderInlineComment($new_comment,
-                                                  $on_right = true);
+                $companion = $this->buildInlineComment(
+                  $new_comment,
+                  $on_right = true);
+
+                $scaffold->addInlineView($companion);
                 unset($new_comments[$n_num][$key]);
               }
             }
           }
-          $html[] = phutil_tag('tr', array('class' => 'inline'), array(
-            phutil_tag('th', array()),
-            phutil_tag('td', array(), $comment_html),
-            phutil_tag('th', array()),
-            phutil_tag('td', array('colspan' => 3), $new),
-          ));
+
+          $html[] = $scaffold;
         }
       }
       if ($n_num && isset($new_comments[$n_num])) {
         foreach ($new_comments[$n_num] as $comment) {
-          $comment_html = $this->renderInlineComment($comment,
-                                                     $on_right = true);
-          $html[] = phutil_tag('tr', array('class' => 'inline'), array(
-            phutil_tag('th', array()),
-            phutil_tag('td', array()),
-            phutil_tag('th', array()),
-            phutil_tag(
-              'td',
-              array('colspan' => 3),
-              $comment_html),
-          ));
+          $inline = $this->buildInlineComment(
+            $comment,
+            $on_right = true);
+          $html[] = $this->getRowScaffoldForInline($inline);
         }
       }
     }
@@ -340,27 +334,18 @@
     $html_new = array();
     foreach ($this->getOldComments() as $on_line => $comment_group) {
       foreach ($comment_group as $comment) {
-        $comment_html = $this->renderInlineComment($comment, $on_right = false);
-        $html_old[] = phutil_tag('tr', array('class' => 'inline'), array(
-          phutil_tag('th', array()),
-          phutil_tag('td', array(), $comment_html),
-          phutil_tag('th', array()),
-          phutil_tag('td', array('colspan' => 3)),
-        ));
+        $inline = $this->buildInlineComment(
+          $comment,
+          $on_right = false);
+        $html_old[] = $this->getRowScaffoldForInline($inline);
       }
     }
     foreach ($this->getNewComments() as $lin_line => $comment_group) {
       foreach ($comment_group as $comment) {
-        $comment_html = $this->renderInlineComment($comment, $on_right = true);
-        $html_new[] = phutil_tag('tr', array('class' => 'inline'), array(
-          phutil_tag('th', array()),
-          phutil_tag('td', array()),
-          phutil_tag('th', array()),
-          phutil_tag(
-            'td',
-            array('colspan' => 3),
-            $comment_html),
-        ));
+        $inline = $this->buildInlineComment(
+          $comment,
+          $on_right = true);
+        $html_new[] = $this->getRowScaffoldForInline($inline);
       }
     }
 
diff --git a/src/infrastructure/diff/view/PHUIDiffInlineCommentRowScaffold.php b/src/infrastructure/diff/view/PHUIDiffInlineCommentRowScaffold.php
--- a/src/infrastructure/diff/view/PHUIDiffInlineCommentRowScaffold.php
+++ b/src/infrastructure/diff/view/PHUIDiffInlineCommentRowScaffold.php
@@ -20,4 +20,12 @@
     return $this;
   }
 
+  protected function getRowAttributes() {
+    // TODO: This is semantic information used by the JS when placing comments
+    // and using keyboard navigation; we should move it out of class names.
+    return array(
+      'class' => 'inline',
+    );
+  }
+
 }
diff --git a/src/infrastructure/diff/view/PHUIDiffOneUpInlineCommentRowScaffold.php b/src/infrastructure/diff/view/PHUIDiffOneUpInlineCommentRowScaffold.php
--- a/src/infrastructure/diff/view/PHUIDiffOneUpInlineCommentRowScaffold.php
+++ b/src/infrastructure/diff/view/PHUIDiffOneUpInlineCommentRowScaffold.php
@@ -27,7 +27,7 @@
       phutil_tag('td', $attrs, $inline),
     );
 
-    return phutil_tag('tr', array(), $cells);
+    return phutil_tag('tr', $this->getRowAttributes(), $cells);
   }
 
 }
diff --git a/src/infrastructure/diff/view/PHUIDiffTwoUpInlineCommentRowScaffold.php b/src/infrastructure/diff/view/PHUIDiffTwoUpInlineCommentRowScaffold.php
--- a/src/infrastructure/diff/view/PHUIDiffTwoUpInlineCommentRowScaffold.php
+++ b/src/infrastructure/diff/view/PHUIDiffTwoUpInlineCommentRowScaffold.php
@@ -66,7 +66,7 @@
       phutil_tag('td', $right_attrs, $right_side),
     );
 
-    return phutil_tag('tr', array(), $cells);
+    return phutil_tag('tr', $this->getRowAttributes(), $cells);
   }
 
 }