diff --git a/features/alerts.yml b/features/alerts.yml
new file mode 100644
index 00000000000..a9ea4e994b9
--- /dev/null
+++ b/features/alerts.yml
@@ -0,0 +1,7 @@
+name: Alerts
+description: "The `window.alert()`, `window.confirm()`, and `window.prompt()` methods open modal dialogs for notifying the user, asking for confirmation, or entering text."
+spec: https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#user-prompts
+compat_features:
+  - api.Window.alert
+  - api.Window.confirm
+  - api.Window.prompt
diff --git a/features/alerts.yml.dist b/features/alerts.yml.dist
new file mode 100644
index 00000000000..04c63a690be
--- /dev/null
+++ b/features/alerts.yml.dist
@@ -0,0 +1,19 @@
+# Generated from: alerts.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  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: "1"
+    safari_ios: "1"
+compat_features:
+  - api.Window.alert
+  - api.Window.confirm
+  - api.Window.prompt
diff --git a/features/window-management.yml b/features/window-management.yml
index 5668983e4bc..106710f113d 100644
--- a/features/window-management.yml
+++ b/features/window-management.yml
@@ -21,4 +21,5 @@ compat_features:
   - api.ScreenDetails.screens
   - api.ScreenDetails.screenschange_event
   - api.Window.getScreenDetails
+  - api.Window.open.relative-multi-screen
   - http.headers.Permissions-Policy.window-management
diff --git a/features/window-management.yml.dist b/features/window-management.yml.dist
index 9c78b636309..a85e23bf873 100644
--- a/features/window-management.yml.dist
+++ b/features/window-management.yml.dist
@@ -7,6 +7,15 @@ status:
     chrome: "111"
     edge: "111"
 compat_features:
+  # baseline: false
+  # support:
+  #   chrome: "100"
+  #   chrome_android: "100"
+  #   edge: "100"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  - api.Window.open.relative-multi-screen
+
   # baseline: false
   # support:
   #   chrome: "100"
diff --git a/features/window.yml b/features/window.yml
index 1174fa6ba63..773d0e08108 100644
--- a/features/window.yml
+++ b/features/window.yml
@@ -18,6 +18,8 @@ compat_features:
   - api.Window.load_event
   - api.Window.name
   - api.Window.open
+  - api.Window.open.features_parameter_popup
+  - api.Window.open.once_per_event
   - api.Window.opener
   - api.Window.parent
   - api.Window.self
diff --git a/features/window.yml.dist b/features/window.yml.dist
index 8fd0cc7924f..b6e0e62fc67 100644
--- a/features/window.yml.dist
+++ b/features/window.yml.dist
@@ -127,3 +127,22 @@ compat_features:
   #   firefox_android: "4"
   #   safari: "1"
   - api.Window.open
+
+  # baseline: false
+  # support:
+  #   chrome: "23"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "65"
+  #   firefox_android: "65"
+  #   safari: "11"
+  - api.Window.open.once_per_event
+
+  # baseline: false
+  # support:
+  #   chrome: "98"
+  #   chrome_android: "98"
+  #   edge: "98"
+  #   firefox: "96"
+  #   firefox_android: "96"
+  - api.Window.open.features_parameter_popup