diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 4ec460f..6ac6714 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -35,7 +35,12 @@
       :host(.no-left) .sideBySide ::content .right:not([data-value]) + td {
         display: none;
       }
-      .thread-group, ::slotted(*) .thread-group {
+      ::slotted(*) .thread-group {
+        display: block;
+        max-width: var(--content-width, 80ch);
+        white-space: normal;
+      }
+      .thread-group {
         display: block;
         max-width: var(--content-width, 80ch);
         white-space: normal;
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
index d2f9214..633e081 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
@@ -86,6 +86,9 @@
    * implements the same behavior as the template parsing for imperative slots.
    */
   Gerrit.slotToContent = function(slot) {
+    if (Polymer.Element) {
+      return slot;
+    }
     const content = document.createElement('content');
     content.name = slot.name;
     content.setAttribute('select', `[slot='${slot.name}']`);