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diff --git a/html.md b/html.md
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+++ b/html.md
@@ -23,6 +23,21 @@ To check by default:
 
     <input type='checkbox' checked>
 
+### Built-in collapsable
+
+    <details>
+        <summary>Description</summary>
+        The rest of this text will be hidden until this is expanded.
+    </details>
+
+### Definitions
+
+    <dl>
+        <dt>Term</dt>
+        <dd>Defintion of term</dd>
+        ...
+    </dl>
+
 ## CLI parsing with `pup`
 
 `pup` is a little command line parser, inspired by `jq`.