diff --git a/moli-renderer-v8/src/context_bootstrap/exposed_interfaces/metadata.rs b/moli-renderer-v8/src/context_bootstrap/exposed_interfaces/metadata.rs
index d47353d180..4590d24ed4 100644
--- a/moli-renderer-v8/src/context_bootstrap/exposed_interfaces/metadata.rs
+++ b/moli-renderer-v8/src/context_bootstrap/exposed_interfaces/metadata.rs
@@ -92,6 +92,12 @@ pub(in crate::context_bootstrap) const WORKER_SHARED_INTERFACE_NAMES: &[&str] =
 ];
 
 const SECURE_CONTEXT_ONLY_INTERFACE_NAMES: &[&str] = &[
+    "MIDIPort",
+    "MIDIAccess",
+    "MIDIInput",
+    "MIDIOutput",
+    "MIDIInputMap",
+    "MIDIOutputMap",
     "MediaDeviceInfo",
     "InputDeviceInfo",
     "DeviceMotionEvent",
diff --git a/moli-renderer-v8/src/context_bootstrap/specs/registry.rs b/moli-renderer-v8/src/context_bootstrap/specs/registry.rs
index 0f1d0f1aab..bde71cdce2 100644
--- a/moli-renderer-v8/src/context_bootstrap/specs/registry.rs
+++ b/moli-renderer-v8/src/context_bootstrap/specs/registry.rs
@@ -392,6 +392,30 @@ const CONSTRUCTOR_SPECS_BEFORE_STREAMS: &[ConstructorSpec] = &[
         interface: web_api_interfaces::MessageChannel::DESCRIPTOR,
         kind: ConstructorKind::MessageChannel,
     },
+    ConstructorSpec {
+        interface: web_api_interfaces::MIDIPort::DESCRIPTOR,
+        kind: ConstructorKind::Illegal,
+    },
+    ConstructorSpec {
+        interface: web_api_interfaces::MIDIAccess::DESCRIPTOR,
+        kind: ConstructorKind::Illegal,
+    },
+    ConstructorSpec {
+        interface: web_api_interfaces::MIDIInput::DESCRIPTOR,
+        kind: ConstructorKind::Illegal,
+    },
+    ConstructorSpec {
+        interface: web_api_interfaces::MIDIOutput::DESCRIPTOR,
+        kind: ConstructorKind::Illegal,
+    },
+    ConstructorSpec {
+        interface: web_api_interfaces::MIDIInputMap::DESCRIPTOR,
+        kind: ConstructorKind::Illegal,
+    },
+    ConstructorSpec {
+        interface: web_api_interfaces::MIDIOutputMap::DESCRIPTOR,
+        kind: ConstructorKind::Illegal,
+    },
     ConstructorSpec {
         interface: web_api_interfaces::MessagePort::DESCRIPTOR,
         kind: ConstructorKind::MessagePort,
diff --git a/moli-renderer-v8/src/script_vm/tests/midi_owner_interfaces.rs b/moli-renderer-v8/src/script_vm/tests/midi_owner_interfaces.rs
new file mode 100644
index 0000000000..fbbd3eadbc
--- /dev/null
+++ b/moli-renderer-v8/src/script_vm/tests/midi_owner_interfaces.rs
@@ -0,0 +1,46 @@
+use super::*;
+
+#[test]
+fn midi_owner_interfaces_preserve_native_inheritance_and_realm_contracts() {
+    for url in [
+        "https://midi-owner-interfaces.test/",
+        "http://midi-owner-interfaces.test/",
+        "http://localhost/",
+    ] {
+        let mut vm = new_storage_page_task_executor_test_vm(url);
+        vm.eval("document.body.innerHTML = '<iframe id=child></iframe>'")
+            .unwrap();
+        assert_eq!(vm.eval(r#"(() => {
+  const assert = (ok, message) => { if (!ok) throw Error(message); };
+  const popup = open();
+  assert(popup, 'popup test prerequisite');
+  try {
+    const realms = [window, document.getElementById('child').contentWindow, popup];
+    for (const w of realms) {
+      for (const [name, parentName] of [["MIDIPort","EventTarget"],["MIDIAccess","EventTarget"],["MIDIInput","MIDIPort"],["MIDIOutput","MIDIPort"],["MIDIInputMap","Object"],["MIDIOutputMap","Object"]]) {
+        if (true && !w.isSecureContext) {
+          assert(!(name in w), name + ' hidden in an insecure realm');
+          continue;
+        }
+        const C = w[name], parent = w[parentName];
+        assert(typeof C === 'function' && C.name === name && C.length === 0, name + ' interface object');
+        const descriptor = Object.getOwnPropertyDescriptor(w, name);
+        assert(descriptor.writable && descriptor.configurable && !descriptor.enumerable, name + ' global descriptor');
+        assert(Object.getPrototypeOf(C.prototype) === parent.prototype, name + ' prototype inheritance');
+        assert(Object.getPrototypeOf(C) === (parentName === 'Object' ? w.Function.prototype : parent), name + ' interface inheritance');
+        assert(C.prototype.constructor === C, name + ' prototype constructor');
+        const tag = Object.getOwnPropertyDescriptor(C.prototype, Symbol.toStringTag);
+        assert(tag.value === name && !tag.writable && !tag.enumerable && tag.configurable, name + ' tag');
+        for (const call of [() => C(), () => new C()]) {
+          let error;
+          try { call(); } catch (caught) { error = caught; }
+          assert(error instanceof w.TypeError, name + ' rejects direct construction in the callee realm');
+          if (w !== window) assert(!(error instanceof TypeError), name + ' foreign error realm');
+        }
+      }
+    }
+    return true;
+  } finally { popup.close(); }
+})()"#).unwrap(), "true", "{url}");
+    }
+}
diff --git a/moli-renderer-v8/src/script_vm/tests/mod.rs b/moli-renderer-v8/src/script_vm/tests/mod.rs
index 0a8c70c352..9ea4785518 100644
--- a/moli-renderer-v8/src/script_vm/tests/mod.rs
+++ b/moli-renderer-v8/src/script_vm/tests/mod.rs
@@ -2152,6 +2152,7 @@ mod indexed_db;
 mod inspector_unwrap;
 mod lazy_storage;
 mod lazy_window_surfaces;
+mod midi_owner_interfaces;
 mod mouse_snapshot;
 mod no_cors_header_fill;
 mod observer_callbacks;
diff --git a/moli-renderer-v8/src/web_api_interfaces.rs b/moli-renderer-v8/src/web_api_interfaces.rs
index 099e576fe7..a9171700cd 100644
--- a/moli-renderer-v8/src/web_api_interfaces.rs
+++ b/moli-renderer-v8/src/web_api_interfaces.rs
@@ -296,6 +296,12 @@ interfaces! {
     MediaQueryListEvent: Event;
     MediaSource: EventTarget;
     MemoryInfo;
+    MIDIPort: EventTarget;
+    MIDIAccess: EventTarget;
+    MIDIInput: MIDIPort;
+    MIDIOutput: MIDIPort;
+    MIDIInputMap;
+    MIDIOutputMap;
     MessageChannel;
     MessageEvent: Event;
     MessagePort: EventTarget;