diff --git a/src/__tests__/events.js b/src/__tests__/events.js
index 8f8ea563..20d01b0d 100644
--- a/src/__tests__/events.js
+++ b/src/__tests__/events.js
@@ -76,6 +76,11 @@ const eventTypes = [
     events: ['load', 'error'],
     elementType: 'img',
   },
+  {
+    type: '',
+    events: ['offline', 'online'],
+    elementType: 'window',
+  },
   {
     type: '',
     events: ['load', 'error'],
diff --git a/src/event-map.js b/src/event-map.js
index c2bcfaf3..30e4f9d0 100644
--- a/src/event-map.js
+++ b/src/event-map.js
@@ -363,6 +363,15 @@ export const eventMap = {
     EventType: 'PopStateEvent',
     defaultInit: {bubbles: true, cancelable: false},
   },
+  // window events
+  offline: {
+    EventType: 'Event',
+    defaultInit: {bubbles: false, cancelable: false},
+  },
+  online: {
+    EventType: 'Event',
+    defaultInit: {bubbles: false, cancelable: false},
+  },
 }
 
 export const eventAliasMap = {
diff --git a/types/events.d.ts b/types/events.d.ts
index 04095380..57a7edd6 100644
--- a/types/events.d.ts
+++ b/types/events.d.ts
@@ -86,6 +86,8 @@ export type EventType =
   | 'pointerLeave'
   | 'gotPointerCapture'
   | 'lostPointerCapture'
+  | 'offline'
+  | 'online'
 
 export type FireFunction = (
   element: Document | Element | Window | Node,