diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 3857f2171..9a9cc212b 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -2543,7 +2543,7 @@ interface Animatable {
 interface AnimationEventMap {
     "cancel": AnimationPlaybackEvent;
     "finish": AnimationPlaybackEvent;
-    "remove": Event;
+    "remove": AnimationPlaybackEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation) */
@@ -2561,7 +2561,7 @@ interface Animation extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/finish_event) */
     onfinish: ((this: Animation, ev: AnimationPlaybackEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/remove_event) */
-    onremove: ((this: Animation, ev: Event) => any) | null;
+    onremove: ((this: Animation, ev: AnimationPlaybackEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/pending) */
     readonly pending: boolean;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/playState) */
@@ -3003,7 +3003,7 @@ declare var AudioWorklet: {
 };
 
 interface AudioWorkletNodeEventMap {
-    "processorerror": Event;
+    "processorerror": ErrorEvent;
 }
 
 /**
@@ -3013,7 +3013,7 @@ interface AudioWorkletNodeEventMap {
  */
 interface AudioWorkletNode extends AudioNode {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletNode/processorerror_event) */
-    onprocessorerror: ((this: AudioWorkletNode, ev: Event) => any) | null;
+    onprocessorerror: ((this: AudioWorkletNode, ev: ErrorEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletNode/parameters) */
     readonly parameters: AudioParamMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletNode/port) */
@@ -8811,19 +8811,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
@@ -13279,8 +13279,8 @@ declare var HTMLUnknownElement: {
 };
 
 interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "enterpictureinpicture": Event;
-    "leavepictureinpicture": Event;
+    "enterpictureinpicture": PictureInPictureEvent;
+    "leavepictureinpicture": PictureInPictureEvent;
 }
 
 /**
@@ -13298,9 +13298,9 @@ interface HTMLVideoElement extends HTMLMediaElement {
      */
     height: number;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLVideoElement/enterpictureinpicture_event) */
-    onenterpictureinpicture: ((this: HTMLVideoElement, ev: Event) => any) | null;
+    onenterpictureinpicture: ((this: HTMLVideoElement, ev: PictureInPictureEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLVideoElement/leavepictureinpicture_event) */
-    onleavepictureinpicture: ((this: HTMLVideoElement, ev: Event) => any) | null;
+    onleavepictureinpicture: ((this: HTMLVideoElement, ev: PictureInPictureEvent) => any) | null;
     /** Gets or sets the playsinline of the video element. for example, On iPhone, video elements will now be allowed to play inline, and will not automatically enter fullscreen mode when playback begins. */
     playsInline: boolean;
     /**
@@ -14591,7 +14591,7 @@ declare var LockManager: {
 };
 
 interface MIDIAccessEventMap {
-    "statechange": Event;
+    "statechange": MIDIConnectionEvent;
 }
 
 /**
@@ -14603,7 +14603,7 @@ interface MIDIAccess extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/inputs) */
     readonly inputs: MIDIInputMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/statechange_event) */
-    onstatechange: ((this: MIDIAccess, ev: Event) => any) | null;
+    onstatechange: ((this: MIDIAccess, ev: MIDIConnectionEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/outputs) */
     readonly outputs: MIDIOutputMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/sysexEnabled) */
@@ -15114,7 +15114,7 @@ declare var MediaQueryListEvent: {
 
 interface MediaRecorderEventMap {
     "dataavailable": BlobEvent;
-    "error": Event;
+    "error": ErrorEvent;
     "pause": Event;
     "resume": Event;
     "start": Event;
@@ -15130,7 +15130,7 @@ interface MediaRecorder extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/dataavailable_event) */
     ondataavailable: ((this: MediaRecorder, ev: BlobEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/error_event) */
-    onerror: ((this: MediaRecorder, ev: Event) => any) | null;
+    onerror: ((this: MediaRecorder, ev: ErrorEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/pause_event) */
     onpause: ((this: MediaRecorder, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/resume_event) */
@@ -16883,7 +16883,7 @@ declare var PaymentMethodChangeEvent: {
 };
 
 interface PaymentRequestEventMap {
-    "paymentmethodchange": Event;
+    "paymentmethodchange": PaymentMethodChangeEvent;
     "shippingaddresschange": Event;
     "shippingoptionchange": Event;
 }
@@ -16898,7 +16898,7 @@ interface PaymentRequest extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/PaymentRequest/id) */
     readonly id: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/PaymentRequest/paymentmethodchange_event) */
-    onpaymentmethodchange: ((this: PaymentRequest, ev: Event) => any) | null;
+    onpaymentmethodchange: ((this: PaymentRequest, ev: PaymentMethodChangeEvent) => any) | null;
     /**
      * @deprecated
      *
@@ -17917,7 +17917,7 @@ interface RTCDataChannelEventMap {
     "bufferedamountlow": Event;
     "close": Event;
     "closing": Event;
-    "error": Event;
+    "error": RTCErrorEvent;
     "message": MessageEvent;
     "open": Event;
 }
@@ -17947,7 +17947,7 @@ interface RTCDataChannel extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/closing_event) */
     onclosing: ((this: RTCDataChannel, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/error_event) */
-    onerror: ((this: RTCDataChannel, ev: Event) => any) | null;
+    onerror: ((this: RTCDataChannel, ev: RTCErrorEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/message_event) */
     onmessage: ((this: RTCDataChannel, ev: MessageEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/open_event) */
@@ -17988,7 +17988,7 @@ declare var RTCDataChannelEvent: {
 };
 
 interface RTCDtlsTransportEventMap {
-    "error": Event;
+    "error": RTCErrorEvent;
     "statechange": Event;
 }
 
@@ -17997,7 +17997,7 @@ interface RTCDtlsTransport extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDtlsTransport/iceTransport) */
     readonly iceTransport: RTCIceTransport;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDtlsTransport/error_event) */
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
+    onerror: ((this: RTCDtlsTransport, ev: RTCErrorEvent) => any) | null;
     onstatechange: ((this: RTCDtlsTransport, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDtlsTransport/state) */
     readonly state: RTCDtlsTransportState;
diff --git a/baselines/serviceworker.generated.d.ts b/baselines/serviceworker.generated.d.ts
index e5121f8c1..cf7a9fe55 100644
--- a/baselines/serviceworker.generated.d.ts
+++ b/baselines/serviceworker.generated.d.ts
@@ -2716,19 +2716,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
diff --git a/baselines/sharedworker.generated.d.ts b/baselines/sharedworker.generated.d.ts
index 3618ef060..5d3d78419 100644
--- a/baselines/sharedworker.generated.d.ts
+++ b/baselines/sharedworker.generated.d.ts
@@ -2605,19 +2605,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
diff --git a/baselines/ts5.5/dom.generated.d.ts b/baselines/ts5.5/dom.generated.d.ts
index 3857f2171..9a9cc212b 100644
--- a/baselines/ts5.5/dom.generated.d.ts
+++ b/baselines/ts5.5/dom.generated.d.ts
@@ -2543,7 +2543,7 @@ interface Animatable {
 interface AnimationEventMap {
     "cancel": AnimationPlaybackEvent;
     "finish": AnimationPlaybackEvent;
-    "remove": Event;
+    "remove": AnimationPlaybackEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation) */
@@ -2561,7 +2561,7 @@ interface Animation extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/finish_event) */
     onfinish: ((this: Animation, ev: AnimationPlaybackEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/remove_event) */
-    onremove: ((this: Animation, ev: Event) => any) | null;
+    onremove: ((this: Animation, ev: AnimationPlaybackEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/pending) */
     readonly pending: boolean;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Animation/playState) */
@@ -3003,7 +3003,7 @@ declare var AudioWorklet: {
 };
 
 interface AudioWorkletNodeEventMap {
-    "processorerror": Event;
+    "processorerror": ErrorEvent;
 }
 
 /**
@@ -3013,7 +3013,7 @@ interface AudioWorkletNodeEventMap {
  */
 interface AudioWorkletNode extends AudioNode {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletNode/processorerror_event) */
-    onprocessorerror: ((this: AudioWorkletNode, ev: Event) => any) | null;
+    onprocessorerror: ((this: AudioWorkletNode, ev: ErrorEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletNode/parameters) */
     readonly parameters: AudioParamMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletNode/port) */
@@ -8811,19 +8811,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
@@ -13279,8 +13279,8 @@ declare var HTMLUnknownElement: {
 };
 
 interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "enterpictureinpicture": Event;
-    "leavepictureinpicture": Event;
+    "enterpictureinpicture": PictureInPictureEvent;
+    "leavepictureinpicture": PictureInPictureEvent;
 }
 
 /**
@@ -13298,9 +13298,9 @@ interface HTMLVideoElement extends HTMLMediaElement {
      */
     height: number;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLVideoElement/enterpictureinpicture_event) */
-    onenterpictureinpicture: ((this: HTMLVideoElement, ev: Event) => any) | null;
+    onenterpictureinpicture: ((this: HTMLVideoElement, ev: PictureInPictureEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLVideoElement/leavepictureinpicture_event) */
-    onleavepictureinpicture: ((this: HTMLVideoElement, ev: Event) => any) | null;
+    onleavepictureinpicture: ((this: HTMLVideoElement, ev: PictureInPictureEvent) => any) | null;
     /** Gets or sets the playsinline of the video element. for example, On iPhone, video elements will now be allowed to play inline, and will not automatically enter fullscreen mode when playback begins. */
     playsInline: boolean;
     /**
@@ -14591,7 +14591,7 @@ declare var LockManager: {
 };
 
 interface MIDIAccessEventMap {
-    "statechange": Event;
+    "statechange": MIDIConnectionEvent;
 }
 
 /**
@@ -14603,7 +14603,7 @@ interface MIDIAccess extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/inputs) */
     readonly inputs: MIDIInputMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/statechange_event) */
-    onstatechange: ((this: MIDIAccess, ev: Event) => any) | null;
+    onstatechange: ((this: MIDIAccess, ev: MIDIConnectionEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/outputs) */
     readonly outputs: MIDIOutputMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MIDIAccess/sysexEnabled) */
@@ -15114,7 +15114,7 @@ declare var MediaQueryListEvent: {
 
 interface MediaRecorderEventMap {
     "dataavailable": BlobEvent;
-    "error": Event;
+    "error": ErrorEvent;
     "pause": Event;
     "resume": Event;
     "start": Event;
@@ -15130,7 +15130,7 @@ interface MediaRecorder extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/dataavailable_event) */
     ondataavailable: ((this: MediaRecorder, ev: BlobEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/error_event) */
-    onerror: ((this: MediaRecorder, ev: Event) => any) | null;
+    onerror: ((this: MediaRecorder, ev: ErrorEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/pause_event) */
     onpause: ((this: MediaRecorder, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaRecorder/resume_event) */
@@ -16883,7 +16883,7 @@ declare var PaymentMethodChangeEvent: {
 };
 
 interface PaymentRequestEventMap {
-    "paymentmethodchange": Event;
+    "paymentmethodchange": PaymentMethodChangeEvent;
     "shippingaddresschange": Event;
     "shippingoptionchange": Event;
 }
@@ -16898,7 +16898,7 @@ interface PaymentRequest extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/PaymentRequest/id) */
     readonly id: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/PaymentRequest/paymentmethodchange_event) */
-    onpaymentmethodchange: ((this: PaymentRequest, ev: Event) => any) | null;
+    onpaymentmethodchange: ((this: PaymentRequest, ev: PaymentMethodChangeEvent) => any) | null;
     /**
      * @deprecated
      *
@@ -17917,7 +17917,7 @@ interface RTCDataChannelEventMap {
     "bufferedamountlow": Event;
     "close": Event;
     "closing": Event;
-    "error": Event;
+    "error": RTCErrorEvent;
     "message": MessageEvent;
     "open": Event;
 }
@@ -17947,7 +17947,7 @@ interface RTCDataChannel extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/closing_event) */
     onclosing: ((this: RTCDataChannel, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/error_event) */
-    onerror: ((this: RTCDataChannel, ev: Event) => any) | null;
+    onerror: ((this: RTCDataChannel, ev: RTCErrorEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/message_event) */
     onmessage: ((this: RTCDataChannel, ev: MessageEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDataChannel/open_event) */
@@ -17988,7 +17988,7 @@ declare var RTCDataChannelEvent: {
 };
 
 interface RTCDtlsTransportEventMap {
-    "error": Event;
+    "error": RTCErrorEvent;
     "statechange": Event;
 }
 
@@ -17997,7 +17997,7 @@ interface RTCDtlsTransport extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDtlsTransport/iceTransport) */
     readonly iceTransport: RTCIceTransport;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDtlsTransport/error_event) */
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
+    onerror: ((this: RTCDtlsTransport, ev: RTCErrorEvent) => any) | null;
     onstatechange: ((this: RTCDtlsTransport, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCDtlsTransport/state) */
     readonly state: RTCDtlsTransportState;
diff --git a/baselines/ts5.5/serviceworker.generated.d.ts b/baselines/ts5.5/serviceworker.generated.d.ts
index e5121f8c1..cf7a9fe55 100644
--- a/baselines/ts5.5/serviceworker.generated.d.ts
+++ b/baselines/ts5.5/serviceworker.generated.d.ts
@@ -2716,19 +2716,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
diff --git a/baselines/ts5.5/sharedworker.generated.d.ts b/baselines/ts5.5/sharedworker.generated.d.ts
index 3618ef060..5d3d78419 100644
--- a/baselines/ts5.5/sharedworker.generated.d.ts
+++ b/baselines/ts5.5/sharedworker.generated.d.ts
@@ -2605,19 +2605,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
diff --git a/baselines/ts5.5/webworker.generated.d.ts b/baselines/ts5.5/webworker.generated.d.ts
index c438eafb0..f034e1b48 100644
--- a/baselines/ts5.5/webworker.generated.d.ts
+++ b/baselines/ts5.5/webworker.generated.d.ts
@@ -2253,7 +2253,7 @@ declare var DecompressionStream: {
 interface DedicatedWorkerGlobalScopeEventMap extends WorkerGlobalScopeEventMap {
     "message": MessageEvent;
     "messageerror": MessageEvent;
-    "rtctransform": Event;
+    "rtctransform": RTCTransformEvent;
 }
 
 /**
@@ -2273,7 +2273,7 @@ interface DedicatedWorkerGlobalScope extends WorkerGlobalScope, AnimationFramePr
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/messageerror_event) */
     onmessageerror: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/rtctransform_event) */
-    onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: Event) => any) | null;
+    onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: RTCTransformEvent) => any) | null;
     /**
      * Aborts dedicatedWorkerGlobal.
      *
@@ -2982,19 +2982,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
@@ -9204,7 +9204,7 @@ declare var onmessage: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) =>
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/messageerror_event) */
 declare var onmessageerror: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) => any) | null;
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/rtctransform_event) */
-declare var onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: Event) => any) | null;
+declare var onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: RTCTransformEvent) => any) | null;
 /**
  * Aborts dedicatedWorkerGlobal.
  *
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index c438eafb0..f034e1b48 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -2253,7 +2253,7 @@ declare var DecompressionStream: {
 interface DedicatedWorkerGlobalScopeEventMap extends WorkerGlobalScopeEventMap {
     "message": MessageEvent;
     "messageerror": MessageEvent;
-    "rtctransform": Event;
+    "rtctransform": RTCTransformEvent;
 }
 
 /**
@@ -2273,7 +2273,7 @@ interface DedicatedWorkerGlobalScope extends WorkerGlobalScope, AnimationFramePr
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/messageerror_event) */
     onmessageerror: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/rtctransform_event) */
-    onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: Event) => any) | null;
+    onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: RTCTransformEvent) => any) | null;
     /**
      * Aborts dedicatedWorkerGlobal.
      *
@@ -2982,19 +2982,19 @@ declare var FontFace: {
 };
 
 interface FontFaceSetEventMap {
-    "loading": Event;
-    "loadingdone": Event;
-    "loadingerror": Event;
+    "loading": FontFaceSetLoadEvent;
+    "loadingdone": FontFaceSetLoadEvent;
+    "loadingerror": FontFaceSetLoadEvent;
 }
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet) */
 interface FontFaceSet extends EventTarget {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event) */
-    onloading: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloading: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event) */
-    onloadingdone: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingdone: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event) */
-    onloadingerror: ((this: FontFaceSet, ev: Event) => any) | null;
+    onloadingerror: ((this: FontFaceSet, ev: FontFaceSetLoadEvent) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready) */
     readonly ready: Promise<FontFaceSet>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/FontFaceSet/status) */
@@ -9204,7 +9204,7 @@ declare var onmessage: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) =>
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/messageerror_event) */
 declare var onmessageerror: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) => any) | null;
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/rtctransform_event) */
-declare var onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: Event) => any) | null;
+declare var onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: RTCTransformEvent) => any) | null;
 /**
  * Aborts dedicatedWorkerGlobal.
  *
diff --git a/package-lock.json b/package-lock.json
index 0ab321914..dee35783b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,6 +18,7 @@
         "@typescript-eslint/parser": "^8",
         "@webref/css": "^6.12.7",
         "@webref/elements": "^2.3.0",
+        "@webref/events": "^1.11.3",
         "@webref/idl": "^3.46.1",
         "bcd-idl-mapper": "^2.3.0",
         "cpx2": "^7.0.1",
@@ -834,6 +835,12 @@
       "integrity": "sha512-Xx1kWwL1v/rnexfZ8GMsXYHYtoYYpBmdlDEzr6yAdpIf6REd6GTitPvr+AOsOT+t+FSeuvAsgPJgFFel0ghrrQ==",
       "dev": true
     },
+    "node_modules/@webref/events": {
+      "version": "1.11.3",
+      "resolved": "https://registry.npmjs.org/@webref/events/-/events-1.11.3.tgz",
+      "integrity": "sha512-rBC7DwZMNIhSUPueQHhCwTa6iUzSRQkM2TcSBzuHe2Bz3XEs+4inPn+CLTPpww6W6Yr9Eb5jT9S2wFbaZNHi0g==",
+      "dev": true
+    },
     "node_modules/@webref/idl": {
       "version": "3.53.0",
       "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.53.0.tgz",
diff --git a/package.json b/package.json
index f757fefde..a829d653f 100644
--- a/package.json
+++ b/package.json
@@ -46,6 +46,7 @@
     "@typescript-eslint/parser": "^8",
     "@webref/css": "^6.12.7",
     "@webref/elements": "^2.3.0",
+    "@webref/events": "^1.11.3",
     "@webref/idl": "^3.46.1",
     "bcd-idl-mapper": "^2.3.0",
     "cpx2": "^7.0.1",
diff --git a/src/build.ts b/src/build.ts
index e794a4dbf..45b35612a 100644
--- a/src/build.ts
+++ b/src/build.ts
@@ -10,6 +10,7 @@ import {
   getRemovalData,
 } from "./build/bcd.js";
 import { getInterfaceElementMergeData } from "./build/webref/elements.js";
+import { getInterfaceToEventMap } from "./build/webref/events.js";
 import { getWebidls } from "./build/webref/idl.js";
 import jsonc from "jsonc-parser";
 
@@ -46,6 +47,7 @@ async function emitFlavor(
 ) {
   const exposed = getExposedTypes(webidl, options.global, forceKnownTypes);
   mergeNamesakes(exposed);
+  exposed.events = webidl.events;
 
   const result = emitWebIdl(
     exposed,
@@ -197,7 +199,9 @@ async function emitDom() {
   }
 
   /// Load the input file
-  let webidl: Browser.WebIdl = {};
+  let webidl: Browser.WebIdl = {
+    events: await getInterfaceToEventMap(),
+  };
 
   for (const w of widlStandardTypes) {
     webidl = merge(webidl, w.browser, true);
diff --git a/src/build/emitter.ts b/src/build/emitter.ts
index 7c232bc0d..7ac260ce4 100644
--- a/src/build/emitter.ts
+++ b/src/build/emitter.ts
@@ -338,6 +338,11 @@ export function emitWebIdl(
         return getGenericEventType(event.type);
       }
     }
+
+    const event = webidl.events?.get(i.name)?.get(eName);
+    if (event && allInterfacesMap[event]) {
+      return getGenericEventType(event);
+    }
     return "Event";
   }
 
diff --git a/src/build/types.d.ts b/src/build/types.d.ts
index 056a314d4..b3c68a68f 100644
--- a/src/build/types.d.ts
+++ b/src/build/types.d.ts
@@ -263,4 +263,5 @@ export interface WebIdl {
     typedef: TypeDef[];
   };
   namespaces?: Interface[];
+  events?: Map<string, Map<string, string>>;
 }
diff --git a/src/build/utils/map.ts b/src/build/utils/map.ts
index 552d48429..c79035e34 100644
--- a/src/build/utils/map.ts
+++ b/src/build/utils/map.ts
@@ -16,3 +16,14 @@ export function addToStringMap(
   const old = map.get(name) || "";
   map.set(name, `${old}\n${value}\n`);
 }
+
+export function addToNestedMap(
+  map: Map<string, Map<string, string>>,
+  name: string,
+  key: string,
+  value: string,
+): void {
+  const nested = map.get(name) ?? new Map();
+  nested.set(key, value);
+  map.set(name, nested);
+}
diff --git a/src/build/webref/events.ts b/src/build/webref/events.ts
new file mode 100644
index 000000000..19d415965
--- /dev/null
+++ b/src/build/webref/events.ts
@@ -0,0 +1,19 @@
+import { listAll } from "@webref/events";
+import { addToNestedMap } from "../utils/map.js";
+
+export async function getInterfaceToEventMap(): Promise<
+  Map<string, Map<string, string>>
+> {
+  const all = await listAll();
+  const map = new Map<string, Map<string, string>>();
+  for (const item of Object.values(all)) {
+    const { targets } = item;
+    for (const target of targets) {
+      addToNestedMap(map, target.target, item.type, item.interface);
+      for (const path of target.bubblingPath ?? []) {
+        addToNestedMap(map, path, item.type, item.interface);
+      }
+    }
+  }
+  return map;
+}
diff --git a/src/build/webref/webref-events.d.ts b/src/build/webref/webref-events.d.ts
new file mode 100644
index 000000000..4a6d6eda1
--- /dev/null
+++ b/src/build/webref/webref-events.d.ts
@@ -0,0 +1,19 @@
+declare module "@webref/events" {
+  interface Src {
+    format: string;
+    href: string;
+  }
+  interface Target {
+    target: string;
+    bubbles?: boolean;
+    bubblingPath?: string[];
+  }
+  interface Item {
+    src: Src;
+    href: string;
+    type: string;
+    targets: Target[];
+    interface: string;
+  }
+  function listAll(): Promise<Record<string, Item>>;
+}