diff --git a/demo.html b/demo.html
index a62581017..c75e4b96e 100644
--- a/demo.html
+++ b/demo.html
@@ -115,6 +115,18 @@ <h3>video</h3>
         <video controls></video>
         <video></video>
 
+        <h1>Interactive content</h1>
+
+        <h3>details / summary</h3>
+        <details>
+            <summary>More info</summary>
+            <p>Additional information</p>
+            <ul>
+                <li>Point 1</li>
+                <li>Point 2</li>
+            </ul>
+        </details>
+
         <h1>Grouping content</h1>
 
         <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et m.</p>