diff --git a/api-reports/2_12.txt b/api-reports/2_12.txt
index a115d22cf..3f4f8df0b 100644
--- a/api-reports/2_12.txt
+++ b/api-reports/2_12.txt
@@ -15128,7 +15128,7 @@ raw/IDBDatabase[JC] def dispatchEvent(evt: Event): Boolean
 raw/IDBDatabase[JC] def name: String
 raw/IDBDatabase[JC] def objectStoreNames: DOMStringList
 raw/IDBDatabase[JC] var onabort: js.Function1[Event, _]
-raw/IDBDatabase[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBDatabase[JC] var onerror: js.Function1[Event, _]
 raw/IDBDatabase[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/IDBDatabase[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/IDBDatabase[JC] def transaction(storeNames: js.Any, mode: String?): IDBTransaction
@@ -15175,7 +15175,7 @@ raw/IDBOpenDBRequest[JC] def addEventListener[T <: Event](`type`: String, listen
 raw/IDBOpenDBRequest[JC] def dispatchEvent(evt: Event): Boolean
 raw/IDBOpenDBRequest[JC] def error: DOMException
 raw/IDBOpenDBRequest[JC] var onblocked: js.Function1[Event, _]
-raw/IDBOpenDBRequest[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBOpenDBRequest[JC] var onerror: js.Function1[Event, _]
 raw/IDBOpenDBRequest[JC] var onsuccess: js.Function1[Event, _]
 raw/IDBOpenDBRequest[JC] var onupgradeneeded: js.Function1[IDBVersionChangeEvent, _]
 raw/IDBOpenDBRequest[JC] def readyState: String
@@ -15188,7 +15188,7 @@ raw/IDBRequest[JC] def addEventListener[T <: Event](`type`: String, listener: js
 raw/IDBRequest[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/IDBRequest[JC] def dispatchEvent(evt: Event): Boolean
 raw/IDBRequest[JC] def error: DOMException
-raw/IDBRequest[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBRequest[JC] var onerror: js.Function1[Event, _]
 raw/IDBRequest[JC] var onsuccess: js.Function1[Event, _]
 raw/IDBRequest[JC] def readyState: String
 raw/IDBRequest[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
@@ -15206,7 +15206,7 @@ raw/IDBTransaction[JC] def mode: String
 raw/IDBTransaction[JC] def objectStore(name: String): IDBObjectStore
 raw/IDBTransaction[JC] var onabort: js.Function1[Event, _]
 raw/IDBTransaction[JC] var oncomplete: js.Function1[Event, _]
-raw/IDBTransaction[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBTransaction[JC] var onerror: js.Function1[Event, _]
 raw/IDBTransaction[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/IDBTransaction[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/IDBTransaction[JO] val READ_ONLY: String
@@ -24370,14 +24370,14 @@ raw/XMLHttpRequest[JC] def create(): XMLHttpRequest
 raw/XMLHttpRequest[JC] def dispatchEvent(evt: Event): Boolean
 raw/XMLHttpRequest[JC] def getAllResponseHeaders(): String
 raw/XMLHttpRequest[JC] def getResponseHeader(header: String): String
-raw/XMLHttpRequest[JC] var onabort: js.Function1[js.Any, _]
-raw/XMLHttpRequest[JC] var onerror: js.Function1[ErrorEvent, _]
-raw/XMLHttpRequest[JC] var onload: js.Function1[Event, _]
+raw/XMLHttpRequest[JC] var onabort: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequest[JC] var onerror: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequest[JC] var onload: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] var onloadend: js.Function1[ProgressEvent, _]
-raw/XMLHttpRequest[JC] var onloadstart: js.Function1[js.Any, _]
+raw/XMLHttpRequest[JC] var onloadstart: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] var onprogress: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] var onreadystatechange: js.Function1[Event, _]
-raw/XMLHttpRequest[JC] var ontimeout: js.Function1[Event, _]
+raw/XMLHttpRequest[JC] var ontimeout: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] def open(method: String, url: String, async: Boolean?, user: String?, password: String?): Unit
 raw/XMLHttpRequest[JC] def readyState: Int
 raw/XMLHttpRequest[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
@@ -24402,13 +24402,13 @@ raw/XMLHttpRequest[JO] var UNSENT: Int
 raw/XMLHttpRequestEventTarget[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/XMLHttpRequestEventTarget[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/XMLHttpRequestEventTarget[JT] def dispatchEvent(evt: Event): Boolean
-raw/XMLHttpRequestEventTarget[JT] var onabort: js.Function1[js.Any, _]
-raw/XMLHttpRequestEventTarget[JT] var onerror: js.Function1[ErrorEvent, _]
-raw/XMLHttpRequestEventTarget[JT] var onload: js.Function1[js.Any, _]
+raw/XMLHttpRequestEventTarget[JT] var onabort: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequestEventTarget[JT] var onerror: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequestEventTarget[JT] var onload: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequestEventTarget[JT] var onloadend: js.Function1[ProgressEvent, _]
-raw/XMLHttpRequestEventTarget[JT] var onloadstart: js.Function1[js.Any, _]
+raw/XMLHttpRequestEventTarget[JT] var onloadstart: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequestEventTarget[JT] var onprogress: js.Function1[ProgressEvent, _]
-raw/XMLHttpRequestEventTarget[JT] var ontimeout: js.Function1[js.Any, _]
+raw/XMLHttpRequestEventTarget[JT] var ontimeout: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequestEventTarget[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/XMLHttpRequestEventTarget[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/XMLSerializer[JC] def serializeToString(target: Node): String
diff --git a/api-reports/2_13.txt b/api-reports/2_13.txt
index d6dbf8bce..f726af3aa 100644
--- a/api-reports/2_13.txt
+++ b/api-reports/2_13.txt
@@ -15128,7 +15128,7 @@ raw/IDBDatabase[JC] def dispatchEvent(evt: Event): Boolean
 raw/IDBDatabase[JC] def name: String
 raw/IDBDatabase[JC] def objectStoreNames: DOMStringList
 raw/IDBDatabase[JC] var onabort: js.Function1[Event, _]
-raw/IDBDatabase[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBDatabase[JC] var onerror: js.Function1[Event, _]
 raw/IDBDatabase[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/IDBDatabase[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/IDBDatabase[JC] def transaction(storeNames: js.Any, mode: String?): IDBTransaction
@@ -15175,7 +15175,7 @@ raw/IDBOpenDBRequest[JC] def addEventListener[T <: Event](`type`: String, listen
 raw/IDBOpenDBRequest[JC] def dispatchEvent(evt: Event): Boolean
 raw/IDBOpenDBRequest[JC] def error: DOMException
 raw/IDBOpenDBRequest[JC] var onblocked: js.Function1[Event, _]
-raw/IDBOpenDBRequest[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBOpenDBRequest[JC] var onerror: js.Function1[Event, _]
 raw/IDBOpenDBRequest[JC] var onsuccess: js.Function1[Event, _]
 raw/IDBOpenDBRequest[JC] var onupgradeneeded: js.Function1[IDBVersionChangeEvent, _]
 raw/IDBOpenDBRequest[JC] def readyState: String
@@ -15188,7 +15188,7 @@ raw/IDBRequest[JC] def addEventListener[T <: Event](`type`: String, listener: js
 raw/IDBRequest[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/IDBRequest[JC] def dispatchEvent(evt: Event): Boolean
 raw/IDBRequest[JC] def error: DOMException
-raw/IDBRequest[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBRequest[JC] var onerror: js.Function1[Event, _]
 raw/IDBRequest[JC] var onsuccess: js.Function1[Event, _]
 raw/IDBRequest[JC] def readyState: String
 raw/IDBRequest[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
@@ -15206,7 +15206,7 @@ raw/IDBTransaction[JC] def mode: String
 raw/IDBTransaction[JC] def objectStore(name: String): IDBObjectStore
 raw/IDBTransaction[JC] var onabort: js.Function1[Event, _]
 raw/IDBTransaction[JC] var oncomplete: js.Function1[Event, _]
-raw/IDBTransaction[JC] var onerror: js.Function1[ErrorEvent, _]
+raw/IDBTransaction[JC] var onerror: js.Function1[Event, _]
 raw/IDBTransaction[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/IDBTransaction[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/IDBTransaction[JO] val READ_ONLY: String
@@ -24370,14 +24370,14 @@ raw/XMLHttpRequest[JC] def create(): XMLHttpRequest
 raw/XMLHttpRequest[JC] def dispatchEvent(evt: Event): Boolean
 raw/XMLHttpRequest[JC] def getAllResponseHeaders(): String
 raw/XMLHttpRequest[JC] def getResponseHeader(header: String): String
-raw/XMLHttpRequest[JC] var onabort: js.Function1[js.Any, _]
-raw/XMLHttpRequest[JC] var onerror: js.Function1[ErrorEvent, _]
-raw/XMLHttpRequest[JC] var onload: js.Function1[Event, _]
+raw/XMLHttpRequest[JC] var onabort: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequest[JC] var onerror: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequest[JC] var onload: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] var onloadend: js.Function1[ProgressEvent, _]
-raw/XMLHttpRequest[JC] var onloadstart: js.Function1[js.Any, _]
+raw/XMLHttpRequest[JC] var onloadstart: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] var onprogress: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] var onreadystatechange: js.Function1[Event, _]
-raw/XMLHttpRequest[JC] var ontimeout: js.Function1[Event, _]
+raw/XMLHttpRequest[JC] var ontimeout: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequest[JC] def open(method: String, url: String, async: Boolean?, user: String?, password: String?): Unit
 raw/XMLHttpRequest[JC] def readyState: Int
 raw/XMLHttpRequest[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
@@ -24402,13 +24402,13 @@ raw/XMLHttpRequest[JO] var UNSENT: Int
 raw/XMLHttpRequestEventTarget[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/XMLHttpRequestEventTarget[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/XMLHttpRequestEventTarget[JT] def dispatchEvent(evt: Event): Boolean
-raw/XMLHttpRequestEventTarget[JT] var onabort: js.Function1[js.Any, _]
-raw/XMLHttpRequestEventTarget[JT] var onerror: js.Function1[ErrorEvent, _]
-raw/XMLHttpRequestEventTarget[JT] var onload: js.Function1[js.Any, _]
+raw/XMLHttpRequestEventTarget[JT] var onabort: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequestEventTarget[JT] var onerror: js.Function1[ProgressEvent, _]
+raw/XMLHttpRequestEventTarget[JT] var onload: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequestEventTarget[JT] var onloadend: js.Function1[ProgressEvent, _]
-raw/XMLHttpRequestEventTarget[JT] var onloadstart: js.Function1[js.Any, _]
+raw/XMLHttpRequestEventTarget[JT] var onloadstart: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequestEventTarget[JT] var onprogress: js.Function1[ProgressEvent, _]
-raw/XMLHttpRequestEventTarget[JT] var ontimeout: js.Function1[js.Any, _]
+raw/XMLHttpRequestEventTarget[JT] var ontimeout: js.Function1[ProgressEvent, _]
 raw/XMLHttpRequestEventTarget[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/XMLHttpRequestEventTarget[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/XMLSerializer[JC] def serializeToString(target: Node): String
diff --git a/src/main/scala/org/scalajs/dom/raw/Idb.scala b/src/main/scala/org/scalajs/dom/raw/Idb.scala
index f6ef5e53a..d71ed41e4 100644
--- a/src/main/scala/org/scalajs/dom/raw/Idb.scala
+++ b/src/main/scala/org/scalajs/dom/raw/Idb.scala
@@ -509,7 +509,7 @@ class IDBTransaction extends EventTarget {
    *
    * MDN
    */
-  var onerror: js.Function1[ErrorEvent, _] = js.native
+  var onerror: js.Function1[Event, _] = js.native
 
   /**
    * The event handler for the onabort event.
@@ -613,7 +613,7 @@ class IDBDatabase extends EventTarget {
    *
    * MDN
    */
-  var onerror: js.Function1[ErrorEvent, _] = js.native
+  var onerror: js.Function1[Event, _] = js.native
 
   /**
    * Fires when access of the database is aborted.
@@ -788,7 +788,7 @@ class IDBRequest extends EventTarget {
    *
    * MDN
    */
-  var onerror: js.Function1[ErrorEvent, _] = js.native
+  var onerror: js.Function1[Event, _] = js.native
 
   /**
    * The state of the request. Every request starts in the pending state. The state
diff --git a/src/main/scala/org/scalajs/dom/raw/lib.scala b/src/main/scala/org/scalajs/dom/raw/lib.scala
index 66a1c880e..6775062c3 100644
--- a/src/main/scala/org/scalajs/dom/raw/lib.scala
+++ b/src/main/scala/org/scalajs/dom/raw/lib.scala
@@ -4104,7 +4104,7 @@ class XMLHttpRequest extends EventTarget {
    */
   def responseURL: js.UndefOr[String] = js.native
 
-  var ontimeout: js.Function1[Event, _] = js.native
+  var ontimeout: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * The response string returned by the HTTP server. Unlike status, this includes the
@@ -4124,7 +4124,7 @@ class XMLHttpRequest extends EventTarget {
    * MDN
    */
   var timeout: Double = js.native
-  var onload: js.Function1[Event, _] = js.native
+  var onload: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * Initializes a request. This method is to be used from JavaScript code; to
@@ -4187,7 +4187,7 @@ class XMLHttpRequest extends EventTarget {
    */
   var withCredentials: Boolean = js.native
   var onprogress: js.Function1[ProgressEvent, _] = js.native
-  var onabort: js.Function1[js.Any, _] = js.native
+  var onabort: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * Can be set to change the response type. Value Data type of response property ""
@@ -4223,8 +4223,8 @@ class XMLHttpRequest extends EventTarget {
    * MDN
    */
   var upload: XMLHttpRequestEventTarget = js.native
-  var onerror: js.Function1[ErrorEvent, _] = js.native
-  var onloadstart: js.Function1[js.Any, _] = js.native
+  var onerror: js.Function1[ProgressEvent, _] = js.native
+  var onloadstart: js.Function1[ProgressEvent, _] = js.native
 }
 
 @js.native
@@ -7325,7 +7325,7 @@ trait XMLHttpRequestEventTarget extends EventTarget {
    *
    * MDN
    */
-  var onerror: js.Function1[ErrorEvent, _] = js.native
+  var onerror: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * The function to call when an HTTP request returns after successfully loading
@@ -7333,7 +7333,7 @@ trait XMLHttpRequestEventTarget extends EventTarget {
    *
    * MDN
    */
-  var onload: js.Function1[js.Any, _] = js.native
+  var onload: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * A function that is called if the event times out; this only happens if a timeout has
@@ -7342,21 +7342,21 @@ trait XMLHttpRequestEventTarget extends EventTarget {
    *
    * MDN
    */
-  var ontimeout: js.Function1[js.Any, _] = js.native
+  var ontimeout: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * The function to call when a request is aborted.
    *
    * MDN
    */
-  var onabort: js.Function1[js.Any, _] = js.native
+  var onabort: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * A function that gets called when the HTTP request first begins loading data.
    *
    * MDN
    */
-  var onloadstart: js.Function1[js.Any, _] = js.native
+  var onloadstart: js.Function1[ProgressEvent, _] = js.native
 
   /**
    * A function that is called when the load is completed, even if the request failed.