diff --git a/.eslintrc.js b/.eslintrc.js
index 3d0f283e781f75..0f11677ccabf0d 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -320,6 +320,7 @@ module.exports = {
     'node-core/no-duplicate-requires': 'error',
   },
   globals: {
+    CustomEvent: 'readable',
     Crypto: 'readable',
     CryptoKey: 'readable',
     fetch: 'readable',
diff --git a/doc/api/cli.md b/doc/api/cli.md
index b46469fc0a0788..0b54048d58abec 100644
--- a/doc/api/cli.md
+++ b/doc/api/cli.md
@@ -280,6 +280,14 @@ added: v16.15.0
 
 Enable experimental support for the [Fetch API][].
 
+### `--experimental-global-customevent`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Expose the [CustomEvent Web API][] on the global scope.
+
 ### `--experimental-global-webcrypto`
 
 <!-- YAML
@@ -1619,6 +1627,7 @@ Node.js options that are allowed are:
 * `--enable-source-maps`
 * `--experimental-abortcontroller`
 * `--experimental-fetch`
+* `--experimental-global-customevent`
 * `--experimental-global-webcrypto`
 * `--experimental-import-meta-resolve`
 * `--experimental-json-modules`
@@ -2041,6 +2050,7 @@ done
 [#42511]: https://github.com/nodejs/node/issues/42511
 [Chrome DevTools Protocol]: https://chromedevtools.github.io/devtools-protocol/
 [CommonJS]: modules.md
+[CustomEvent Web API]: https://dom.spec.whatwg.org/#customevent
 [ECMAScript module loader]: esm.md#loaders
 [Fetch API]: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
 [Modules loaders]: packages.md#modules-loaders
diff --git a/doc/api/events.md b/doc/api/events.md
index 8584789691c914..dfda036de18ea3 100644
--- a/doc/api/events.md
+++ b/doc/api/events.md
@@ -1978,6 +1978,31 @@ added: v14.5.0
 
 Removes the `listener` from the list of handlers for event `type`.
 
+### Class: `CustomEvent`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental.
+
+* Extends: {Event}
+
+The `CustomEvent` object is an adaptation of the [`CustomEvent` Web API][].
+Instances are created internally by Node.js.
+
+#### `event.detail`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental.
+
+* Type: {any} Returns custom data passed when initializing.
+
+Read-only.
+
 ### Class: `NodeEventTarget`
 
 <!-- YAML
@@ -2115,6 +2140,7 @@ to the `EventTarget`.
 
 [WHATWG-EventTarget]: https://dom.spec.whatwg.org/#interface-eventtarget
 [`--trace-warnings`]: cli.md#--trace-warnings
+[`CustomEvent` Web API]: https://dom.spec.whatwg.org/#customevent
 [`EventTarget` Web API]: https://dom.spec.whatwg.org/#eventtarget
 [`EventTarget` error handling]: #eventtarget-error-handling
 [`Event` Web API]: https://dom.spec.whatwg.org/#event
diff --git a/doc/api/globals.md b/doc/api/globals.md
index 2c480fa6df7ba0..d30b2b1f359ed1 100644
--- a/doc/api/globals.md
+++ b/doc/api/globals.md
@@ -306,6 +306,19 @@ A browser-compatible implementation of {CryptoKey}. This global is available
 only if the Node.js binary was compiled with including support for the
 `node:crypto` module.
 
+## `CustomEvent`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental. Enable this API with the
+> [`--experimental-global-customevent`][] CLI flag.
+
+<!-- type=global -->
+
+A browser-compatible implementation of the [`CustomEvent` Web API][].
+
 ## `Event`
 
 <!-- YAML
@@ -607,8 +620,10 @@ The object that acts as the namespace for all W3C
 
 [Web Crypto API]: webcrypto.md
 [`--experimental-fetch`]: cli.md#--experimental-fetch
+[`--experimental-global-customevent`]: cli.md#--experimental-global-customevent
 [`--experimental-global-webcrypto`]: cli.md#--experimental-global-webcrypto
 [`AbortController`]: https://developer.mozilla.org/en-US/docs/Web/API/AbortController
+[`CustomEvent` Web API]: https://dom.spec.whatwg.org/#customevent
 [`EventTarget` and `Event` API]: events.md#eventtarget-and-event-api
 [`MessageChannel`]: worker_threads.md#class-messagechannel
 [`MessageEvent`]: https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/MessageEvent
diff --git a/doc/node.1 b/doc/node.1
index 6ace5620506db4..1f704fafee94f9 100644
--- a/doc/node.1
+++ b/doc/node.1
@@ -142,6 +142,9 @@ Enable Source Map V3 support for stack traces.
 .It Fl -experimental-fetch
 Enable experimental support for the Fetch API.
 .
+.It Fl -experimental-global-customevent
+Expose the CustomEvent on the global scope.
+.
 .It Fl -experimental-global-webcrypto
 Expose the Web Crypto API on the global scope.
 .
diff --git a/lib/.eslintrc.yaml b/lib/.eslintrc.yaml
index 9714c9c4f64df2..19629bd80cce03 100644
--- a/lib/.eslintrc.yaml
+++ b/lib/.eslintrc.yaml
@@ -41,6 +41,8 @@ rules:
       message: Use `const { BroadcastChannel } = require('internal/worker/io');` instead of the global.
     - name: Buffer
       message: Use `const { Buffer } = require('buffer');` instead of the global.
+    - name: CustomEvent
+      message: Use `const { CustomEvent } = require('internal/event_target');` instead of the global.
     - name: Event
       message: Use `const { Event } = require('internal/event_target');` instead of the global.
     - name: EventTarget
diff --git a/lib/internal/bootstrap/pre_execution.js b/lib/internal/bootstrap/pre_execution.js
index 19d81549b4fd92..8e6dda482bac51 100644
--- a/lib/internal/bootstrap/pre_execution.js
+++ b/lib/internal/bootstrap/pre_execution.js
@@ -42,6 +42,7 @@ function prepareMainThreadExecution(expandArgv1 = false,
   setupWarningHandler();
   setupFetch();
   setupWebCrypto();
+  setupCustomEvent();
 
   // Resolve the coverage directory to an absolute path, and
   // overwrite process.env so that the original path gets passed
@@ -229,6 +230,17 @@ function setupWebCrypto() {
   }
 }
 
+// TODO(daeyeon): move this to internal/bootstrap/browser when the CLI flag is
+//                removed.
+function setupCustomEvent() {
+  if (process.config.variables.node_no_browser_globals ||
+      !getOptionValue('--experimental-global-customevent')) {
+    return;
+  }
+  const { CustomEvent } = require('internal/event_target');
+  exposeInterface(globalThis, 'CustomEvent', CustomEvent);
+}
+
 // Setup User-facing NODE_V8_COVERAGE environment variable that writes
 // ScriptCoverage to a specified file.
 function setupCoverageHooks(dir) {
@@ -576,6 +588,7 @@ module.exports = {
   setupWarningHandler,
   setupFetch,
   setupWebCrypto,
+  setupCustomEvent,
   setupDebugEnv,
   setupPerfHooks,
   prepareMainThreadExecution,
diff --git a/lib/internal/event_target.js b/lib/internal/event_target.js
index 5b5e909b2b8ec2..f1bc8ce0b55073 100644
--- a/lib/internal/event_target.js
+++ b/lib/internal/event_target.js
@@ -76,6 +76,7 @@ const kTimestamp = Symbol('timestamp');
 const kBubbles = Symbol('bubbles');
 const kComposed = Symbol('composed');
 const kPropagationStopped = Symbol('propagationStopped');
+const kDetail = Symbol('detail');
 
 const isTrustedSet = new SafeWeakSet();
 const isTrusted = ObjectGetOwnPropertyDescriptor({
@@ -327,6 +328,49 @@ ObjectDefineProperties(
     stopPropagation: kEnumerableProperty,
   });
 
+function isCustomEvent(value) {
+  return isEvent(value) && (value?.[kDetail] !== undefined);
+}
+
+class CustomEvent extends Event {
+  /**
+   * @constructor
+   * @param {string} type
+   * @param {{
+   *   bubbles?: boolean,
+   *   cancelable?: boolean,
+   *   composed?: boolean,
+   *   detail?: any,
+   * }} [options]
+   */
+  constructor(type, options = kEmptyObject) {
+    if (arguments.length === 0)
+      throw new ERR_MISSING_ARGS('type');
+    super(type, options);
+    this[kDetail] = options?.detail ?? null;
+  }
+
+  /**
+   * @type {any}
+   */
+  get detail() {
+    if (!isCustomEvent(this))
+      throw new ERR_INVALID_THIS('CustomEvent');
+    return this[kDetail];
+  }
+}
+
+ObjectDefineProperties(CustomEvent.prototype, {
+  [SymbolToStringTag]: {
+    __proto__: null,
+    writable: false,
+    enumerable: false,
+    configurable: true,
+    value: 'CustomEvent',
+  },
+  detail: kEnumerableProperty,
+});
+
 class NodeCustomEvent extends Event {
   constructor(type, options) {
     super(type, options);
@@ -989,6 +1033,7 @@ const EventEmitterMixin = (Superclass) => {
 
 module.exports = {
   Event,
+  CustomEvent,
   EventEmitterMixin,
   EventTarget,
   NodeEventTarget,
diff --git a/lib/internal/main/worker_thread.js b/lib/internal/main/worker_thread.js
index 91ca93e6e10062..e21c1b1fe2cc7f 100644
--- a/lib/internal/main/worker_thread.js
+++ b/lib/internal/main/worker_thread.js
@@ -19,6 +19,7 @@ const {
   setupWarningHandler,
   setupFetch,
   setupWebCrypto,
+  setupCustomEvent,
   setupDebugEnv,
   setupPerfHooks,
   initializeDeprecations,
@@ -71,6 +72,7 @@ setupDebugEnv();
 setupWarningHandler();
 setupFetch();
 setupWebCrypto();
+setupCustomEvent();
 initializeSourceMapsHandlers();
 
 // Since worker threads cannot switch cwd, we do not need to
diff --git a/src/node_options.cc b/src/node_options.cc
index 3ab323e0086ac7..b82100b6907891 100644
--- a/src/node_options.cc
+++ b/src/node_options.cc
@@ -339,6 +339,10 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             &EnvironmentOptions::experimental_fetch,
             kAllowedInEnvironment);
   AddOption("--experimental-json-modules", "", NoOp{}, kAllowedInEnvironment);
+  AddOption("--experimental-global-customevent",
+            "expose experimental CustomEvent on the global scope",
+            &EnvironmentOptions::experimental_global_customevent,
+            kAllowedInEnvironment);
   AddOption("--experimental-global-webcrypto",
             "expose experimental Web Crypto API on the global scope",
             &EnvironmentOptions::experimental_global_web_crypto,
diff --git a/src/node_options.h b/src/node_options.h
index 26f9226e0b0afe..32e68086502f3e 100644
--- a/src/node_options.h
+++ b/src/node_options.h
@@ -109,6 +109,7 @@ class EnvironmentOptions : public Options {
   bool enable_source_maps = false;
   bool experimental_https_modules = false;
   bool experimental_fetch = false;
+  bool experimental_global_customevent = false;
   bool experimental_global_web_crypto = false;
   std::string experimental_specifier_resolution;
   bool experimental_wasm_modules = false;
diff --git a/test/common/index.js b/test/common/index.js
index 1b62c9610893e5..b9c075ba64e153 100644
--- a/test/common/index.js
+++ b/test/common/index.js
@@ -315,6 +315,9 @@ if (hasCrypto && global.crypto) {
   knownGlobals.push(global.CryptoKey);
   knownGlobals.push(global.SubtleCrypto);
 }
+if (global.CustomEvent) {
+  knownGlobals.push(global.CustomEvent);
+}
 
 function allowGlobals(...allowlist) {
   knownGlobals = knownGlobals.concat(allowlist);
diff --git a/test/parallel/test-events-customevent.js b/test/parallel/test-events-customevent.js
new file mode 100644
index 00000000000000..dc4acb312c1131
--- /dev/null
+++ b/test/parallel/test-events-customevent.js
@@ -0,0 +1,325 @@
+// Flags: --expose-internals
+
+'use strict';
+
+const common = require('../common');
+const { ok, strictEqual, deepStrictEqual, throws } = require('node:assert');
+const { inspect } = require('node:util');
+const { Event, EventTarget, CustomEvent } = require('internal/event_target');
+
+{
+  ok(CustomEvent);
+
+  // Default string
+  const tag = Object.prototype.toString.call(new CustomEvent('$'));
+  strictEqual(tag, '[object CustomEvent]');
+}
+
+{
+  // No argument behavior - throw TypeError
+  throws(() => {
+    new CustomEvent();
+  }, TypeError);
+
+  throws(() => new CustomEvent(Symbol()), TypeError);
+
+  // Too many arguments passed behavior - ignore additional arguments
+  const ev = new CustomEvent('foo', {}, {});
+  strictEqual(ev.type, 'foo');
+}
+
+{
+  const ev = new CustomEvent('$');
+  strictEqual(ev.type, '$');
+  strictEqual(ev.bubbles, false);
+  strictEqual(ev.cancelable, false);
+  strictEqual(ev.detail, null);
+}
+
+{
+  // Coercion to string works
+  strictEqual(new CustomEvent(1).type, '1');
+  strictEqual(new CustomEvent(false).type, 'false');
+  strictEqual(new CustomEvent({}).type, String({}));
+}
+
+{
+  const ev = new CustomEvent('$', {
+    detail: 56,
+    sweet: 'x',
+    cancelable: true,
+  });
+  strictEqual(ev.type, '$');
+  strictEqual(ev.bubbles, false);
+  strictEqual(ev.cancelable, true);
+  strictEqual(ev.sweet, undefined);
+  strictEqual(ev.detail, 56);
+}
+
+{
+  // Any types of value for `detail` are acceptable.
+  ['foo', 1, false, [], {}].forEach((i) => {
+    const ev = new CustomEvent('$', { detail: i });
+    strictEqual(ev.detail, i);
+  });
+}
+
+{
+  // Readonly `detail` behavior
+  const ev = new CustomEvent('$', {
+    detail: 56,
+  });
+  strictEqual(ev.detail, 56);
+  try {
+    ev.detail = 96;
+    // eslint-disable-next-line no-unused-vars
+  } catch (error) {
+    common.mustCall()();
+  }
+  strictEqual(ev.detail, 56);
+}
+
+{
+  const ev = new Event('$', {
+    detail: 96,
+  });
+  strictEqual(ev.detail, undefined);
+}
+
+// The following tests verify whether CustomEvent works the same as Event
+// except carrying custom data. They're based on `parallel/test-eventtarget.js`.
+
+{
+  const ev = new CustomEvent('$');
+  strictEqual(ev.type, '$');
+  strictEqual(ev.bubbles, false);
+  strictEqual(ev.cancelable, false);
+  strictEqual(ev.detail, null);
+
+  strictEqual(ev.defaultPrevented, false);
+  strictEqual(typeof ev.timeStamp, 'number');
+
+  // Compatibility properties with the DOM
+  deepStrictEqual(ev.composedPath(), []);
+  strictEqual(ev.returnValue, true);
+  strictEqual(ev.composed, false);
+  strictEqual(ev.isTrusted, false);
+  strictEqual(ev.eventPhase, 0);
+  strictEqual(ev.cancelBubble, false);
+
+  // Not cancelable
+  ev.preventDefault();
+  strictEqual(ev.defaultPrevented, false);
+}
+
+{
+  // Invalid options
+  ['foo', 1, false].forEach((i) =>
+    throws(() => new CustomEvent('foo', i), {
+      code: 'ERR_INVALID_ARG_TYPE',
+      name: 'TypeError',
+      message:
+        'The "options" argument must be of type object.' +
+        common.invalidArgTypeHelper(i),
+    }),
+  );
+}
+
+{
+  const ev = new CustomEvent('$');
+  strictEqual(ev.constructor.name, 'CustomEvent');
+
+  // CustomEvent Statics
+  strictEqual(CustomEvent.NONE, 0);
+  strictEqual(CustomEvent.CAPTURING_PHASE, 1);
+  strictEqual(CustomEvent.AT_TARGET, 2);
+  strictEqual(CustomEvent.BUBBLING_PHASE, 3);
+  strictEqual(new CustomEvent('foo').eventPhase, CustomEvent.NONE);
+
+  // CustomEvent is a function
+  strictEqual(CustomEvent.length, 1);
+}
+
+{
+  const ev = new CustomEvent('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.cancelBubble = true;
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new CustomEvent('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.stopPropagation();
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new CustomEvent('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.cancelBubble = 'some-truthy-value';
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new CustomEvent('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.cancelBubble = true;
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new CustomEvent('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.stopPropagation();
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new CustomEvent('foo');
+  strictEqual(ev.cancelBubble, false);
+  ev.cancelBubble = 'some-truthy-value';
+  strictEqual(ev.cancelBubble, true);
+}
+{
+  const ev = new CustomEvent('foo', { cancelable: true });
+  strictEqual(ev.type, 'foo');
+  strictEqual(ev.cancelable, true);
+  strictEqual(ev.defaultPrevented, false);
+
+  ev.preventDefault();
+  strictEqual(ev.defaultPrevented, true);
+}
+{
+  const ev = new CustomEvent('foo');
+  deepStrictEqual(Object.keys(ev), ['isTrusted']);
+}
+
+// Works with EventTarget
+
+{
+  const obj = { sweet: 'x', memory: { x: 56, y: 96 } };
+  const et = new EventTarget();
+  const ev = new CustomEvent('$', { detail: obj });
+  const fn = common.mustCall((event) => {
+    strictEqual(event, ev);
+    deepStrictEqual(event.detail, obj);
+  });
+  et.addEventListener('$', fn);
+  et.dispatchEvent(ev);
+}
+
+{
+  const eventTarget = new EventTarget();
+  const event = new CustomEvent('$');
+  eventTarget.dispatchEvent(event);
+  strictEqual(event.target, eventTarget);
+}
+
+{
+  const obj = { sweet: 'x' };
+  const eventTarget = new EventTarget();
+
+  const ev1 = common.mustCall(function(event) {
+    strictEqual(event.type, 'foo');
+    strictEqual(event.detail, obj);
+    strictEqual(this, eventTarget);
+    strictEqual(event.eventPhase, 2);
+  }, 2);
+
+  const ev2 = {
+    handleEvent: common.mustCall(function(event) {
+      strictEqual(event.type, 'foo');
+      strictEqual(event.detail, obj);
+      strictEqual(this, ev2);
+    }),
+  };
+
+  eventTarget.addEventListener('foo', ev1);
+  eventTarget.addEventListener('foo', ev2, { once: true });
+  ok(eventTarget.dispatchEvent(new CustomEvent('foo', { detail: obj })));
+  eventTarget.dispatchEvent(new CustomEvent('foo', { detail: obj }));
+
+  eventTarget.removeEventListener('foo', ev1);
+  eventTarget.dispatchEvent(new CustomEvent('foo'));
+}
+
+{
+  // Same event dispatched multiple times.
+  const obj = { sweet: 'x' };
+  const event = new CustomEvent('foo', { detail: obj });
+  const eventTarget1 = new EventTarget();
+  const eventTarget2 = new EventTarget();
+
+  eventTarget1.addEventListener(
+    'foo',
+    common.mustCall((event) => {
+      strictEqual(event.eventPhase, CustomEvent.AT_TARGET);
+      strictEqual(event.target, eventTarget1);
+      strictEqual(event.detail, obj);
+      deepStrictEqual(event.composedPath(), [eventTarget1]);
+    }),
+  );
+
+  eventTarget2.addEventListener(
+    'foo',
+    common.mustCall((event) => {
+      strictEqual(event.eventPhase, CustomEvent.AT_TARGET);
+      strictEqual(event.target, eventTarget2);
+      strictEqual(event.detail, obj);
+      deepStrictEqual(event.composedPath(), [eventTarget2]);
+    }),
+  );
+
+  eventTarget1.dispatchEvent(event);
+  strictEqual(event.eventPhase, CustomEvent.NONE);
+  strictEqual(event.target, eventTarget1);
+  deepStrictEqual(event.composedPath(), []);
+
+  eventTarget2.dispatchEvent(event);
+  strictEqual(event.eventPhase, CustomEvent.NONE);
+  strictEqual(event.target, eventTarget2);
+  deepStrictEqual(event.composedPath(), []);
+}
+
+{
+  const obj = { sweet: 'x' };
+  const target = new EventTarget();
+  const event = new CustomEvent('foo', { detail: obj });
+
+  strictEqual(event.target, null);
+
+  target.addEventListener(
+    'foo',
+    common.mustCall((event) => {
+      strictEqual(event.target, target);
+      strictEqual(event.currentTarget, target);
+      strictEqual(event.srcElement, target);
+      strictEqual(event.detail, obj);
+    }),
+  );
+  target.dispatchEvent(event);
+}
+
+{
+  // Event subclassing
+  const SubEvent = class extends CustomEvent {};
+  const ev = new SubEvent('foo', { detail: 56 });
+  const eventTarget = new EventTarget();
+  const fn = common.mustCall((event) => {
+    strictEqual(event, ev);
+    strictEqual(event.detail, 56);
+  });
+  eventTarget.addEventListener('foo', fn, { once: true });
+  eventTarget.dispatchEvent(ev);
+}
+
+// Works with inspect
+
+{
+  const ev = new CustomEvent('test');
+  const evConstructorName = inspect(ev, {
+    depth: -1,
+  });
+  strictEqual(evConstructorName, 'CustomEvent');
+
+  const inspectResult = inspect(ev, {
+    depth: 1,
+  });
+  ok(inspectResult.includes('CustomEvent'));
+}
diff --git a/test/parallel/test-eventtarget-brandcheck.js b/test/parallel/test-eventtarget-brandcheck.js
index ffb0dcdaf08fb5..3d2fb013f6839d 100644
--- a/test/parallel/test-eventtarget-brandcheck.js
+++ b/test/parallel/test-eventtarget-brandcheck.js
@@ -6,6 +6,7 @@ const assert = require('assert');
 
 const {
   Event,
+  CustomEvent,
   EventTarget,
   NodeEventTarget,
 } = require('internal/event_target');
@@ -41,10 +42,37 @@ const {
 });
 
 [
-  'addEventListener',
-  'removeEventListener',
-  'dispatchEvent',
+  'target',
+  'currentTarget',
+  'srcElement',
+  'type',
+  'cancelable',
+  'defaultPrevented',
+  'timeStamp',
+  'returnValue',
+  'bubbles',
+  'composed',
+  'eventPhase',
+  'detail',
+].forEach((i) => {
+  assert.throws(() => Reflect.get(CustomEvent.prototype, i, {}), {
+    code: 'ERR_INVALID_THIS',
+  });
+});
+
+[
+  'stopImmediatePropagation',
+  'preventDefault',
+  'composedPath',
+  'cancelBubble',
+  'stopPropagation',
 ].forEach((i) => {
+  assert.throws(() => Reflect.apply(CustomEvent.prototype[i], [], {}), {
+    code: 'ERR_INVALID_THIS',
+  });
+});
+
+['addEventListener', 'removeEventListener', 'dispatchEvent'].forEach((i) => {
   assert.throws(() => Reflect.apply(EventTarget.prototype[i], [], {}), {
     code: 'ERR_INVALID_THIS',
   });
diff --git a/test/parallel/test-global-customevent.js b/test/parallel/test-global-customevent.js
new file mode 100644
index 00000000000000..a113631a997bb9
--- /dev/null
+++ b/test/parallel/test-global-customevent.js
@@ -0,0 +1,11 @@
+// Flags: --experimental-global-customevent --expose-internals
+'use strict';
+
+require('../common');
+const { strictEqual, ok } = require('node:assert');
+const { CustomEvent: internalCustomEvent } = require('internal/event_target');
+
+// Global
+ok(CustomEvent);
+
+strictEqual(CustomEvent, internalCustomEvent);
diff --git a/test/wpt/status/dom/events.json b/test/wpt/status/dom/events.json
index 9266118feca49f..aa7ba73eb39f7c 100644
--- a/test/wpt/status/dom/events.json
+++ b/test/wpt/status/dom/events.json
@@ -20,17 +20,13 @@
     "fail": {
       "unexpected": [
         "assert_true: expected true got false",
-        "assert_array_equals: lengths differ, expected array [\"bubbles\", \"cancelable\"] length 2, got [\"cancelable\", \"bubbles\", \"sweet\"] length 3",
-        "CustomEvent is not defined"
+        "assert_array_equals: lengths differ, expected array [\"bubbles\", \"cancelable\"] length 2, got [\"cancelable\", \"bubbles\", \"sweet\"] length 3"
       ]
     }
   },
   "EventListener-addEventListener.sub.window.js": {
     "fail": "document is not defined"
   },
-  "EventTarget-constructible.any.js": {
-    "fail": "CustomEvent is not defined"
-  },
   "relatedTarget.window.js": {
     "fail": "document is not defined"
   },
diff --git a/test/wpt/test-events.js b/test/wpt/test-events.js
index 5040d56d6a2c58..6d4a4cff2d9fdc 100644
--- a/test/wpt/test-events.js
+++ b/test/wpt/test-events.js
@@ -4,4 +4,6 @@ const { WPTRunner } = require('../common/wpt');
 
 const runner = new WPTRunner('dom/events');
 
+runner.setFlags(['--experimental-global-customevent']);
+
 runner.runJsTests();
diff --git a/tools/doc/type-parser.mjs b/tools/doc/type-parser.mjs
index c37cbf93fefb92..c77cba7de19fc0 100644
--- a/tools/doc/type-parser.mjs
+++ b/tools/doc/type-parser.mjs
@@ -117,6 +117,7 @@ const customTypesMap = {
   'EventEmitter': 'events.html#class-eventemitter',
   'EventTarget': 'events.html#class-eventtarget',
   'Event': 'events.html#class-event',
+  'CustomEvent': 'events.html#class-customevent',
   'EventListener': 'events.html#event-listener',
 
   'FileHandle': 'fs.html#class-filehandle',