diff --git a/api/Window.json b/api/Window.json
index cb9f3433bfba1d..4da5c255509e11 100644
--- a/api/Window.json
+++ b/api/Window.json
@@ -620,12 +620,28 @@
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/Window/beforeinstallprompt_event",
           "spec_url": "https://wicg.github.io/manifest-incubations/#onbeforeinstallprompt-attribute",
           "support": {
-            "chrome": {
-              "version_added": "44"
-            },
-            "chrome_android": {
-              "version_added": "44"
-            },
+            "chrome": [
+              {
+                "version_added": "61"
+              },
+              {
+                "version_added": "44",
+                "version_removed": "61",
+                "partial_implementation": true,
+                "notes": "The <code>onbeforeinstallprompt</code> event handler property is not supported."
+              }
+            ],
+            "chrome_android": [
+              {
+                "version_added": "61"
+              },
+              {
+                "version_added": "44",
+                "version_removed": "61",
+                "partial_implementation": true,
+                "notes": "The <code>onbeforeinstallprompt</code> event handler property is not supported."
+              }
+            ],
             "edge": {
               "version_added": "≤79"
             },
@@ -638,24 +654,56 @@
             "ie": {
               "version_added": false
             },
-            "opera": {
-              "version_added": "31"
-            },
-            "opera_android": {
-              "version_added": "32"
-            },
+            "opera": [
+              {
+                "version_added": "48"
+              },
+              {
+                "version_added": "31",
+                "version_removed": "48",
+                "partial_implementation": true,
+                "notes": "The <code>onbeforeinstallprompt</code> event handler property is not supported."
+              }
+            ],
+            "opera_android": [
+              {
+                "version_added": "45"
+              },
+              {
+                "version_added": "32",
+                "version_removed": "45",
+                "partial_implementation": true,
+                "notes": "The <code>onbeforeinstallprompt</code> event handler property is not supported."
+              }
+            ],
             "safari": {
               "version_added": false
             },
             "safari_ios": {
               "version_added": false
             },
-            "samsunginternet_android": {
-              "version_added": "5.0"
-            },
-            "webview_android": {
-              "version_added": "44"
-            }
+            "samsunginternet_android": [
+              {
+                "version_added": "8.0"
+              },
+              {
+                "version_added": "5.0",
+                "version_removed": "8.0",
+                "partial_implementation": true,
+                "notes": "The <code>onbeforeinstallprompt</code> event handler property is not supported."
+              }
+            ],
+            "webview_android": [
+              {
+                "version_added": "61"
+              },
+              {
+                "version_added": "44",
+                "version_removed": "61",
+                "partial_implementation": true,
+                "notes": "The <code>onbeforeinstallprompt</code> event handler property is not supported."
+              }
+            ]
           },
           "status": {
             "experimental": false,
@@ -4004,54 +4052,6 @@
           }
         }
       },
-      "onbeforeinstallprompt": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Window/onbeforeinstallprompt",
-          "support": {
-            "chrome": {
-              "version_added": "61"
-            },
-            "chrome_android": {
-              "version_added": "61"
-            },
-            "edge": {
-              "version_added": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": "48"
-            },
-            "opera_android": {
-              "version_added": "45"
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": "8.0"
-            },
-            "webview_android": {
-              "version_added": "61"
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      },
       "ondevicelight": {
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/Window/ondevicelight",