diff --git a/test-all.sh b/test-all.sh
index 3d0ee02a..2306b221 100755
--- a/test-all.sh
+++ b/test-all.sh
@@ -58,6 +58,7 @@ node test-issue-1461-mobile-page-actions.js
 node test-issue-1470-node-tile-helper.js
 node test-issue-1485-live-anim-z.js
 node test-issue-1532-live-fullscreen.js
+node test-naive-banner-tone.js
 node test-issue-1473-reserved-prefixes.js
 node test-issue-1473-prefix-generator.js
 
diff --git a/test-naive-banner-tone.js b/test-naive-banner-tone.js
new file mode 100644
index 00000000..4e65e171
--- /dev/null
+++ b/test-naive-banner-tone.js
@@ -0,0 +1,61 @@
+/* Test: naive-clock banner should be a small neutral notice, not a scary alert card */
+'use strict';
+const vm = require('vm');
+const fs = require('fs');
+const assert = require('assert');
+
+let passed = 0, failed = 0;
+function test(name, fn) {
+  try { fn(); passed++; console.log(`  ✅ ${name}`); }
+  catch (e) { failed++; console.log(`  ❌ ${name}: ${e.message}`); }
+}
+
+// Load observer-detail.js in a VM sandbox
+const src = fs.readFileSync(__dirname + '/public/observer-detail.js', 'utf8');
+const window = {};
+const ctx = vm.createContext({ window, document: { getElementById: () => null, querySelector: () => null, querySelectorAll: () => [], createElement: () => ({ style: {}, classList: { add(){}, remove(){} }, appendChild(){}, setAttribute(){} }), createDocumentFragment: () => ({ appendChild(){} }) }, console, setTimeout, setInterval, clearInterval, fetch: () => Promise.resolve({ ok: true, json: () => Promise.resolve({}) }), location: { hash: '' }, history: { replaceState() {} }, Chart: function() { return { destroy(){}, update(){} }; }, registerPage() {}, L: { map(){ return { setView(){ return this; }, on(){ return this; }, remove(){} }; }, tileLayer(){ return { addTo(){} }; } } });
+vm.runInContext(src, ctx);
+
+const render = ctx.window.ObserverDetailNaiveBanner.render;
+
+const obs = { clock_naive: true, clock_skew_seconds: 3700, clock_skew_count_24h: 5, clock_last_naive_at: '2025-01-01T00:00:00Z' };
+const html = render(obs);
+
+console.log('── naive-banner tone tests ──');
+
+test('no warning emoji', () => {
+  assert.ok(!html.includes('\u26A0'), 'should not contain ⚠️');
+});
+
+test('no role=alert', () => {
+  assert.ok(!html.includes('role="alert"'), 'should use role="note" not "alert"');
+});
+
+test('no shame word: muddies', () => {
+  assert.ok(!html.toLowerCase().includes('muddies'), 'should not say "muddies"');
+});
+
+test('no shame word: clamped in visible copy', () => {
+  // "clamped" should not appear in visible text (ok in comments)
+  assert.ok(!html.toLowerCase().includes('clamped'), 'should not say "clamped"');
+});
+
+test('no yellow background', () => {
+  assert.ok(!html.includes('255,193,7'), 'should not have yellow bg');
+  assert.ok(!html.includes('#ffc107'), 'should not have yellow border');
+});
+
+test('has role=note', () => {
+  assert.ok(html.includes('role="note"'), 'should have role="note"');
+});
+
+test('has details expander', () => {
+  assert.ok(html.includes('<details'), 'should have a <details> expander');
+});
+
+test('single compact container (no big heading)', () => {
+  assert.ok(!html.includes('font-weight:600'), 'no bold heading');
+});
+
+if (failed > 0) { console.log(`\n${failed} FAILED`); process.exit(1); }
+console.log(`\nAll ${passed} passed`);