diff --git a/features/beforeunload.yml b/features/beforeunload.yml
new file mode 100644
index 00000000000..97728f19df9
--- /dev/null
+++ b/features/beforeunload.yml
@@ -0,0 +1,11 @@
+name: Beforeunload
+description: "The `beforeunload` event is fired when the current window is about to be unloaded. Typically this is used to display a dialog to confirm if users really want to leave the page when there is unsaved data that would be lost."
+spec: https://html.spec.whatwg.org/multipage/nav-history-apis.html#the-beforeunloadevent-interface
+# The commented out keys below are deprecated.
+compat_features:
+  - api.BeforeUnloadEvent
+  - api.Window.beforeunload_event
+  #- api.Window.beforeunload_event.event_returnvalue_activation
+  #- api.Window.beforeunload_event.generic_string_displayed
+  - api.Window.beforeunload_event.preventdefault_activation
+  #- api.Window.beforeunload_event.return_string_activation
diff --git a/features/beforeunload.yml.dist b/features/beforeunload.yml.dist
new file mode 100644
index 00000000000..2183431a6a1
--- /dev/null
+++ b/features/beforeunload.yml.dist
@@ -0,0 +1,49 @@
+# Generated from: beforeunload.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "119"
+    chrome_android: "119"
+    edge: "119"
+    firefox: "6"
+    firefox_android: "6"
+    safari: "11"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Window.beforeunload_event
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "30"
+  #   chrome_android: "30"
+  #   edge: "12"
+  #   firefox: "1.5"
+  #   firefox_android: "4"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.BeforeUnloadEvent
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: false
+  # support:
+  #   chrome: "119"
+  #   chrome_android: "119"
+  #   edge: "119"
+  #   firefox: "6"
+  #   firefox_android: "6"
+  #   safari: "11"
+  - api.Window.beforeunload_event.preventdefault_activation
diff --git a/features/draft/spec/html.yml b/features/draft/spec/html.yml
index 9e5115bc9a4..cfade7b5b3f 100644
--- a/features/draft/spec/html.yml
+++ b/features/draft/spec/html.yml
@@ -3,7 +3,6 @@ name: HTML Standard
 description: TODO
 spec: https://html.spec.whatwg.org/multipage/
 compat_features:
-  - api.BeforeUnloadEvent
   - api.CanvasPattern
   - api.CanvasPattern.setTransform
   - api.CustomElementRegistry.get
@@ -466,7 +465,6 @@ compat_features:
   - api.Window
   - api.Window.DOMContentLoaded_event
   - api.Window.alert
-  - api.Window.beforeunload_event
   - api.Window.blur_event
   - api.Window.close
   - api.Window.closed
diff --git a/features/draft/spec/html.yml.dist b/features/draft/spec/html.yml.dist
index 01b86bea390..43ba815d852 100644
--- a/features/draft/spec/html.yml.dist
+++ b/features/draft/spec/html.yml.dist
@@ -206,7 +206,6 @@ compat_features:
   - api.HTMLOptionsCollection.length
   - api.HTMLOptionsCollection.selectedIndex
   - api.Location.assign
-  - api.Window.beforeunload_event
   - api.Window.frameElement
   - api.Window.self
   - api.Window.top
@@ -1562,19 +1561,6 @@ compat_features:
   #   safari_ios: "8"
   - api.Document.currentScript
 
-  # baseline: high
-  # baseline_low_date: 2015-07-29
-  # baseline_high_date: 2018-01-29
-  # support:
-  #   chrome: "30"
-  #   chrome_android: "30"
-  #   edge: "12"
-  #   firefox: "1.5"
-  #   firefox_android: "4"
-  #   safari: "7"
-  #   safari_ios: "7"
-  - api.BeforeUnloadEvent
-
   # baseline: high
   # baseline_low_date: 2015-07-29
   # baseline_high_date: 2018-01-29