Add informative note

w3c · Oct 5, 2021 · 9af3913 · 9af3913
1 parent cc45c40
commit 9af3913
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/index.html b/index.html
@@ -302,6 +302,11 @@ <h3>
           The {{Document/onvisibilitychange}} attribute is an <a>event handler
           IDL attribute</a> for the `"visibilitychange"` event type.
         </p>
+
+        <p class="note">
+          The `"visibilitychange"` event is invoked from the [[HTML]] spec.
+        </p>
+
       </section>
     </section>
     <section id="privacy-security">