diff --git a/core/themes/seven/css/components/entity-meta.css b/core/themes/seven/css/components/entity-meta.css
index dfc9f88a1c..288cdaa2a8 100644
--- a/core/themes/seven/css/components/entity-meta.css
+++ b/core/themes/seven/css/components/entity-meta.css
@@ -59,6 +59,14 @@
   padding: 0.85em 1.25em;
   text-shadow: 0 1px 0 white;
 }
+
+/**
+ * Hide JS summary from the details polyfill to make it consistent with native
+ * details elements.
+ *
+ * @todo Consider removing this after https://www.drupal.org/node/2493957 has
+ *   been solved.
+ */
 .entity-meta .seven-details .summary {
-  display: none; /* Hide JS summaries. @todo Rethink summaries. */
+  display: none;
 }
diff --git a/core/themes/seven/templates/details.html.twig b/core/themes/seven/templates/details.html.twig
index c250d2a5d4..4a1004fef9 100644
--- a/core/themes/seven/templates/details.html.twig
+++ b/core/themes/seven/templates/details.html.twig
@@ -14,7 +14,11 @@
  * @see template_preprocess_details()
  */
 #}
-{# @todo details class has been prefixed to avoid collision with Modernizr. #}
+{#
+  Prefix 'details' class to avoid collision with Modernizr.
+
+  @todo Remove prefix after https://www.drupal.org/node/2981732 has been solved.
+#}
 <details{{ attributes.addClass('seven-details') }}>
   {%- if title -%}
     {%