diff --git a/Userland/Libraries/LibWeb/UIEvents/PointerEvent.cpp b/Userland/Libraries/LibWeb/UIEvents/PointerEvent.cpp
index d810087c979..150b09c3e0e 100644
--- a/Userland/Libraries/LibWeb/UIEvents/PointerEvent.cpp
+++ b/Userland/Libraries/LibWeb/UIEvents/PointerEvent.cpp
@@ -25,6 +25,7 @@ PointerEvent::PointerEvent(JS::Realm& realm, FlyString const& type, PointerEvent
     , m_azimuth_angle(event_init.azimuth_angle.value_or(0))
     , m_pointer_type(event_init.pointer_type)
     , m_is_primary(event_init.is_primary)
+    , m_persistent_device_id(event_init.persistent_device_id)
 {
 }
 
diff --git a/Userland/Libraries/LibWeb/UIEvents/PointerEvent.h b/Userland/Libraries/LibWeb/UIEvents/PointerEvent.h
index 5c6189121de..df93ff48ff2 100644
--- a/Userland/Libraries/LibWeb/UIEvents/PointerEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/PointerEvent.h
@@ -24,6 +24,7 @@ struct PointerEventInit : public MouseEventInit {
     Optional<double> azimuth_angle;
     String pointer_type;
     bool is_primary { false };
+    WebIDL::Long persistent_device_id { 0 };
 };
 
 // https://w3c.github.io/pointerevents/#pointerevent-interface
@@ -49,6 +50,7 @@ public:
     double azimuth_angle() const { return m_azimuth_angle; }
     String const& pointer_type() const { return m_pointer_type; }
     bool is_primary() const { return m_is_primary; }
+    WebIDL::Long persistent_device_id() const { return m_persistent_device_id; }
 
     // https://w3c.github.io/pointerevents/#dom-pointerevent-pressure
     // For hardware and platforms that do not support pressure, the value MUST be 0.5 when in the active buttons state and 0 otherwise.
@@ -119,6 +121,10 @@ private:
     // Indicates if the pointer represents the primary pointer of this pointer type
     // https://w3c.github.io/pointerevents/#dom-pointerevent-isprimary
     bool m_is_primary { false };
+
+    // A unique identifier for the pointing device.
+    // https://w3c.github.io/pointerevents/#dom-pointerevent-persistentdeviceid
+    WebIDL::Long m_persistent_device_id { 0 };
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/UIEvents/PointerEvent.idl b/Userland/Libraries/LibWeb/UIEvents/PointerEvent.idl
index b99851848a9..e2b056182fa 100644
--- a/Userland/Libraries/LibWeb/UIEvents/PointerEvent.idl
+++ b/Userland/Libraries/LibWeb/UIEvents/PointerEvent.idl
@@ -1,5 +1,6 @@
 #import <UIEvents/MouseEvent.idl>
 
+// https://w3c.github.io/pointerevents/#ref-for-dom-pointereventinit-1
 dictionary PointerEventInit : MouseEventInit {
     long pointerId = 0;
     double width = 1;
@@ -13,6 +14,7 @@ dictionary PointerEventInit : MouseEventInit {
     double azimuthAngle;
     DOMString pointerType = "";
     boolean isPrimary = false;
+    long persistentDeviceId = 0;
     // FIXME: sequence<PointerEvent> coalescedEvents = [];
     // FIXME: sequence<PointerEvent> predictedEvents = [];
 };
@@ -33,6 +35,7 @@ interface PointerEvent : MouseEvent {
     readonly attribute double azimuthAngle;
     readonly attribute DOMString pointerType;
     readonly attribute boolean isPrimary;
+    readonly attribute long persistentDeviceId;
     [FIXME, SecureContext] sequence<PointerEvent> getCoalescedEvents();
     [FIXME] sequence<PointerEvent> getPredictedEvents();
 };