Update draft features (#2876)

Author: github-actions[bot]

features/draft/spec/html.yml

@@ -1,4 +1,4 @@
-draft_date: 2025-04-10
+draft_date: 2025-04-17
 name: HTML
 description: TODO
 spec: https://html.spec.whatwg.org/multipage/
@@ -185,7 +185,7 @@ compat_features:
 #   - api.Window.scrollbars
 #   - api.Window.statusbar
 #   - api.Window.toolbar
-# - Beforeunload:
+# - beforeunload:
 #   - api.BeforeUnloadEvent
 #   - api.BeforeUnloadEvent.user_interaction
 #   - api.Window.beforeunload_event