Update index.md

mdn · Sep 29, 2024 · 505c038 · 505c038
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diff --git a/files/en-us/web/api/event/preventdefault/index.md b/files/en-us/web/api/event/preventdefault/index.md
@@ -21,6 +21,8 @@ non-cancelable event, such as one dispatched via
 {{domxref("EventTarget.dispatchEvent()")}}, without specifying
 `cancelable: true` has no effect.
 
+If a passive listener does call preventDefault(), the user agent will do nothing other than generate a console warning.
+
 ## Syntax
 
 ```js-nolint