From 89339cdd969de727be71765f339ef3dc5e1b060f Mon Sep 17 00:00:00 2001
From: German Khokhlov <ouchlock@gmail.com>
Date: Tue, 3 Nov 2026 21:47:13 +0400
Subject: [PATCH] Leave the scope mask off a globe whose container holds no DOM
 children

---
 src/scopeMask.js       | 3 ++-
 src/scopeMask.test.mjs | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/scopeMask.js b/src/scopeMask.js
index a8ecf12f2..1e61a0c2e 100644
--- a/src/scopeMask.js
+++ b/src/scopeMask.js
@@ -454,7 +454,8 @@ function globeOf(target) {
 export function installScopeMask(target) {
   if (_canvas) return;
   const globe = globeOf(target);
-  if (!globe.container) return;
+  // Only a DOM container can hold the mask (an engine double's cannot).
+  if (typeof globe.container?.appendChild !== 'function') return;
   syncScopeMaskAppearance();
   _container = globe.container;
   _globe = globe;
diff --git a/src/scopeMask.test.mjs b/src/scopeMask.test.mjs
index b65d36d1c..0161a9a86 100644
--- a/src/scopeMask.test.mjs
+++ b/src/scopeMask.test.mjs
@@ -801,3 +801,11 @@ test('on a globe engine (Navara) the mask goes into its host container and follo
     dom.restore();
   }
 });
+
+test('an engine without a DOM container gets no mask and no listeners', async () => {
+  const { createFakeEngine } = await import('./globe/testing/fakeEngine.js');
+  const engine = createFakeEngine({ kind: 'navara' });
+  installScopeMask(engine);
+  assert.equal(engine.frames.preRender.numberOfListeners, 0);
+  destroyScopeMask();
+});