add PointerEvent.PointerID and PointerEvent.PointerType

See https://developer.mozilla.org/docs/Web/API/PointerEvent/pointerId
and https://developer.mozilla.org/docs/Web/API/PointerEvent/pointerType.

events.go

@@ -76,7 +76,7 @@ func wrapEvent(o *js.Object) Event {
 	case js.Global.Get("PageTransitionEvent"):
 		return &PageTransitionEvent{ev}
 	case js.Global.Get("PointerEvent"):
-		return &PointerEvent{&MouseEvent{UIEvent: &UIEvent{ev}}}
+		return &PointerEvent{MouseEvent: &MouseEvent{UIEvent: &UIEvent{ev}}}
 	case js.Global.Get("PopStateEvent"):
 		return &PopStateEvent{ev}
 	case js.Global.Get("ProgressEvent"):
@@ -307,7 +307,13 @@ func (ev *MouseEvent) ModifierState(mod string) bool {
 type MutationEvent struct{ *BasicEvent }
 type OfflineAudioCompletionEvent struct{ *BasicEvent }
 type PageTransitionEvent struct{ *BasicEvent }
-type PointerEvent struct{ *MouseEvent }
+
+type PointerEvent struct {
+	*MouseEvent
+	PointerID   int    `js:"pointerId"`
+	PointerType string `js:"pointerType"`
+}
+
 type PopStateEvent struct{ *BasicEvent }
 type ProgressEvent struct{ *BasicEvent }
 type RelatedEvent struct{ *BasicEvent }

v2/events.go

@@ -310,7 +310,12 @@ func (ev *MouseEvent) ModifierState(mod string) bool {
 type MutationEvent struct{ *BasicEvent }
 type OfflineAudioCompletionEvent struct{ *BasicEvent }
 type PageTransitionEvent struct{ *BasicEvent }
+
 type PointerEvent struct{ *MouseEvent }
+
+func (ev *PointerEvent) PointerID() int      { return ev.Get("pointerId").Int() }
+func (ev *PointerEvent) PointerType() string { return ev.Get("pointerType").String() }
+
 type PopStateEvent struct{ *BasicEvent }
 type ProgressEvent struct{ *BasicEvent }
 type RelatedEvent struct{ *BasicEvent }