diff --git a/api/BeforeUnloadEvent.json b/api/BeforeUnloadEvent.json
index 38df09c5335213..ae621f44fb5f5c 100644
--- a/api/BeforeUnloadEvent.json
+++ b/api/BeforeUnloadEvent.json
@@ -44,9 +44,17 @@
         "__compat": {
           "spec_url": "https://html.spec.whatwg.org/multipage/browsing-the-web.html#dom-beforeunloadevent-returnvalue",
           "support": {
-            "chrome": {
-              "version_added": "30"
-            },
+            "chrome": [
+              {
+                "version_added": "119"
+              },
+              {
+                "version_added": "30",
+                "version_removed": "119",
+                "partial_implementation": true,
+                "notes": "Before Chrome 119, an empty string incorrectly activated the confirmation dialog."
+              }
+            ],
             "chrome_android": "mirror",
             "deno": {
               "version_added": false
@@ -76,7 +84,7 @@
           "status": {
             "experimental": false,
             "standard_track": true,
-            "deprecated": false
+            "deprecated": true
           }
         }
       },
diff --git a/api/Window.json b/api/Window.json
index 18d0d4e4fd8fe1..81cafb02edd4c6 100644
--- a/api/Window.json
+++ b/api/Window.json
@@ -356,18 +356,24 @@
         },
         "event_returnvalue_activation": {
           "__compat": {
-            "description": "Activation using <code>event.returnValue = \"string\";</code>",
+            "description": "Activation using <code>event.returnValue = <any-truthy-value>;</code>",
             "support": {
-              "chrome": {
-                "version_added": "30"
-              },
+              "chrome": [
+                {
+                  "version_added": "119"
+                },
+                {
+                  "version_added": "30",
+                  "version_removed": "118",
+                  "partial_implementation": true,
+                  "notes": "Incorrectly activated the dialog with an empty string value."
+                }
+              ],
               "chrome_android": "mirror",
               "deno": {
                 "version_added": false
               },
-              "edge": {
-                "version_added": "12"
-              },
+              "edge": "mirror",
               "firefox": {
                 "version_added": "6"
               },
@@ -434,16 +440,21 @@
             "description": "Activation using <code>event.preventDefault()</code>",
             "support": {
               "chrome": {
-                "version_added": false
+                "version_added": "119"
               },
               "chrome_android": "mirror",
               "deno": {
                 "version_added": false
               },
-              "edge": {
-                "version_added": "12",
-                "version_removed": "79"
-              },
+              "edge": [
+                {
+                  "version_added": "119"
+                },
+                {
+                  "version_added": "12",
+                  "version_removed": "79"
+                }
+              ],
               "firefox": {
                 "version_added": "6"
               },
@@ -472,7 +483,7 @@
         },
         "return_string_activation": {
           "__compat": {
-            "description": "Activation using <code>return \"string\";</code>",
+            "description": "Activation using <code>return <any-truthy-value>;</code>",
             "support": {
               "chrome": {
                 "version_added": "1"