diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index d09e4e173..f2c5e4cf5 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -13134,7 +13134,7 @@ declare var XMLDocument: {
 
 interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
     msCaching: string;
-    onreadystatechange: (ev: ProgressEvent) => any;
+    onreadystatechange: (ev: Event) => any;
     readonly readyState: number;
     readonly response: any;
     readonly responseText: string;
@@ -13160,14 +13160,14 @@ interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
     readonly LOADING: number;
     readonly OPENED: number;
     readonly UNSENT: number;
-    addEventListener(type: "abort", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "error", listener: (ev: ErrorEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "load", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadstart", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "readystatechange", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadstart", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "progress", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "readystatechange", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "abort", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "error", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "load", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "timeout", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
 }
 
@@ -13606,20 +13606,20 @@ interface WindowTimersExtension {
 }
 
 interface XMLHttpRequestEventTarget {
-    onabort: (ev: Event) => any;
-    onerror: (ev: Event) => any;
-    onload: (ev: Event) => any;
+    onabort: (ev: ProgressEvent) => any;
+    onerror: (ev: ProgressEvent) => any;
+    onload: (ev: ProgressEvent) => any;
     onloadend: (ev: ProgressEvent) => any;
-    onloadstart: (ev: Event) => any;
+    onloadstart: (ev: ProgressEvent) => any;
     onprogress: (ev: ProgressEvent) => any;
     ontimeout: (ev: ProgressEvent) => any;
-    addEventListener(type: "abort", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "error", listener: (ev: ErrorEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "load", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadstart", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadstart", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "progress", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "abort", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "error", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "load", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "timeout", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
 }
 
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index de06f7a13..8fad49842 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -709,7 +709,7 @@ declare var Worker: {
 
 interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
     msCaching: string;
-    onreadystatechange: (ev: ProgressEvent) => any;
+    onreadystatechange: (ev: Event) => any;
     readonly readyState: number;
     readonly response: any;
     readonly responseText: string;
@@ -734,14 +734,14 @@ interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
     readonly LOADING: number;
     readonly OPENED: number;
     readonly UNSENT: number;
-    addEventListener(type: "abort", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "error", listener: (ev: ErrorEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "load", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadstart", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "readystatechange", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadstart", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "progress", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "readystatechange", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "abort", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "error", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "load", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "timeout", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
 }
 
@@ -772,11 +772,11 @@ interface AbstractWorker {
 }
 
 interface MSBaseReader {
-    onabort: (ev: Event) => any;
-    onerror: (ev: Event) => any;
-    onload: (ev: Event) => any;
+    onabort: (ev: ProgressEvent) => any;
+    onerror: (ev: ProgressEvent) => any;
+    onload: (ev: ProgressEvent) => any;
     onloadend: (ev: ProgressEvent) => any;
-    onloadstart: (ev: Event) => any;
+    onloadstart: (ev: ProgressEvent) => any;
     onprogress: (ev: ProgressEvent) => any;
     readonly readyState: number;
     readonly result: any;
@@ -784,11 +784,11 @@ interface MSBaseReader {
     readonly DONE: number;
     readonly EMPTY: number;
     readonly LOADING: number;
-    addEventListener(type: "abort", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "error", listener: (ev: ErrorEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "load", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "abort", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "error", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "load", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadstart", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadstart", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "progress", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
 }
@@ -825,13 +825,13 @@ interface XMLHttpRequestEventTarget {
     onloadstart: (ev: Event) => any;
     onprogress: (ev: ProgressEvent) => any;
     ontimeout: (ev: ProgressEvent) => any;
+    addEventListener(type: "loadstart", listener: (ev: Event) => any, useCapture?: boolean): void;
+    addEventListener(type: "progress", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "abort", listener: (ev: Event) => any, useCapture?: boolean): void;
     addEventListener(type: "error", listener: (ev: ErrorEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "load", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
-    addEventListener(type: "loadstart", listener: (ev: Event) => any, useCapture?: boolean): void;
-    addEventListener(type: "progress", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: "timeout", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
+    addEventListener(type: "loadend", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
 }
 
diff --git a/inputfiles/overridingTypes.json b/inputfiles/overridingTypes.json
index 286043172..b6bc8d5c1 100644
--- a/inputfiles/overridingTypes.json
+++ b/inputfiles/overridingTypes.json
@@ -792,5 +792,78 @@
             "setTimeout(handler: any, timeout?: any, ...args: any[]): number",
             "setTimeout(handler: (...args: any[]) => void, timeout: number): number"
         ]
-     }
- ]
+     },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequest",
+        "name": "onreadystatechange",
+        "type": "(ev: Event) => any"
+    },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "onabort",
+        "type": "(ev: ProgressEvent) => any"
+    },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "onerror",
+        "type": "(ev: ProgressEvent) => any"
+    },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "ontimeout",
+        "type": "(ev: ProgressEvent) => any"
+    },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "onloadstart",
+        "type": "(ev: ProgressEvent) => any"
+    },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "onload",
+        "type": "(ev: ProgressEvent) => any"
+    },
+    {
+        "kind": "property",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "onloadend",
+        "type": "(ev: ProgressEvent) => any"
+    },
+    {
+        "kind": "method",
+        "interface": "XMLHttpRequest",
+        "name": "addEventListener",
+        "signatures": [
+            "addEventListener(type: \"readystatechange\", listener: (ev: Event) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"loadstart\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"progress\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"abort\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"error\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"load\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"timeout\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"loadend\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void"
+        ]
+    },
+    {
+        "kind": "method",
+        "interface": "XMLHttpRequestEventTarget",
+        "name": "addEventListener",
+        "signatures": [
+            "addEventListener(type: \"loadstart\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"progress\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"abort\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"error\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"load\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"timeout\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: \"loadend\", listener: (ev: ProgressEvent) => any, useCapture?: boolean): void",
+            "addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void"
+        ]
+    }
+]