diff --git a/hosts/ocaml/browser/test_bytecode_repeat.js b/hosts/ocaml/browser/test_bytecode_repeat.js
new file mode 100644
index 00000000..32b3b365
--- /dev/null
+++ b/hosts/ocaml/browser/test_bytecode_repeat.js
@@ -0,0 +1,230 @@
+#!/usr/bin/env node
+// test_bytecode_repeat.js — Regression test for bytecode when/do/perform bug
+//
+// Tests that (when cond (do (perform ...) (recurse))) correctly resumes
+// the do continuation after perform/cek_resume in bytecode-compiled code.
+//
+// The bug: bytecode-compiled hs-repeat-times only iterates 2x instead of 3x
+// because the do continuation is lost after perform suspension.
+//
+// Source-loaded code works (CEK handles when/do/perform correctly).
+// Bytecode-compiled code fails (VM/CEK handoff loses the continuation).
+//
+// Usage: node hosts/ocaml/browser/test_bytecode_repeat.js
+//
+// Expected output when bug is fixed:
+//   SOURCE:   6 suspensions (3 iterations × 2 waits) ✓
+//   BYTECODE: 6 suspensions (3 iterations × 2 waits) ✓
+
+const fs = require('fs');
+const path = require('path');
+
+const PROJECT_ROOT = path.resolve(__dirname, '../../..');
+const WASM_DIR = path.join(PROJECT_ROOT, 'shared/static/wasm');
+const SX_DIR = path.join(WASM_DIR, 'sx');
+
+// --- Minimal DOM stubs ---
+function makeElement(tag) {
+  const el = {
+    tagName: tag, _attrs: {}, _classes: new Set(), style: {},
+    childNodes: [], children: [], textContent: '', nodeType: 1,
+    classList: {
+      add(c) { el._classes.add(c); },
+      remove(c) { el._classes.delete(c); },
+      contains(c) { return el._classes.has(c); },
+    },
+    setAttribute(k, v) { el._attrs[k] = String(v); },
+    getAttribute(k) { return el._attrs[k] || null; },
+    removeAttribute(k) { delete el._attrs[k]; },
+    appendChild(c) { el.children.push(c); el.childNodes.push(c); return c; },
+    insertBefore(c) { el.children.push(c); el.childNodes.push(c); return c; },
+    removeChild(c) { return c; }, replaceChild(n) { return n; },
+    cloneNode() { return makeElement(tag); },
+    addEventListener() {}, removeEventListener() {}, dispatchEvent() {},
+    get className() { return [...el._classes].join(' '); },
+    get innerHTML() { return ''; }, set innerHTML(v) {},
+    get outerHTML() { return '<' + tag + '>'; },
+    dataset: {}, querySelectorAll() { return []; }, querySelector() { return null; },
+  };
+  return el;
+}
+
+global.window = global;
+global.document = {
+  createElement: makeElement,
+  createDocumentFragment() { return makeElement('fragment'); },
+  head: makeElement('head'), body: makeElement('body'),
+  querySelector() { return null; }, querySelectorAll() { return []; },
+  createTextNode(s) { return { _isText: true, textContent: String(s), nodeType: 3 }; },
+  addEventListener() {},
+  createComment(s) { return { _isComment: true, textContent: s || '', nodeType: 8 }; },
+  getElementsByTagName() { return []; },
+};
+global.localStorage = { getItem() { return null; }, setItem() {}, removeItem() {} };
+global.CustomEvent = class { constructor(n, o) { this.type = n; this.detail = (o || {}).detail || {}; } };
+global.MutationObserver = class { observe() {} disconnect() {} };
+global.requestIdleCallback = fn => setTimeout(fn, 0);
+global.matchMedia = () => ({ matches: false });
+global.navigator = { serviceWorker: { register() { return Promise.resolve(); } } };
+global.location = { href: '', pathname: '/', hostname: 'localhost' };
+global.history = { pushState() {}, replaceState() {} };
+global.fetch = () => Promise.resolve({ ok: true, text() { return Promise.resolve(''); } });
+global.XMLHttpRequest = class { open() {} send() {} };
+
+async function main() {
+  // Load WASM kernel
+  require(path.join(WASM_DIR, 'sx_browser.bc.js'));
+  const K = globalThis.SxKernel;
+  if (!K) { console.error('FATAL: SxKernel not found'); process.exit(1); }
+
+  // Register FFI
+  K.registerNative('host-global', args => (args[0] in globalThis) ? globalThis[args[0]] : null);
+  K.registerNative('host-get', args => { if (args[0] == null) return null; const v = args[0][args[1]]; return v === undefined ? null : v; });
+  K.registerNative('host-set!', args => { if (args[0] != null) args[0][args[1]] = args[2]; return args[2]; });
+  K.registerNative('host-call', args => {
+    const [obj, method, ...rest] = args;
+    if (obj == null || typeof obj[method] !== 'function') return null;
+    return obj[method].apply(obj, rest) ?? null;
+  });
+  K.registerNative('host-new', args => new (Function.prototype.bind.apply(args[0], [null, ...args.slice(1)])));
+  K.registerNative('host-callback', args => {
+    const fn = args[0];
+    return function() { return K.callFn(fn, Array.from(arguments)); };
+  });
+  K.registerNative('host-typeof', args => typeof args[0]);
+  K.registerNative('host-await', args => args[0]);
+
+  K.eval('(define SX_VERSION "test-bc-repeat")');
+  K.eval('(define SX_ENGINE "ocaml-vm-test")');
+  K.eval('(define parse sx-parse)');
+  K.eval('(define serialize sx-serialize)');
+
+  // DOM stubs for HS runtime
+  K.eval('(define dom-add-class (fn (el cls) (host-call (host-get el "classList") "add" cls)))');
+  K.eval('(define dom-remove-class (fn (el cls) (host-call (host-get el "classList") "remove" cls)))');
+  K.eval('(define dom-has-class? (fn (el cls) (host-call (host-get el "classList") "contains" cls)))');
+  K.eval('(define dom-listen (fn (target event-name handler) (handler {:type event-name :target target})))');
+
+  // --- Test helper: count suspensions ---
+  function countSuspensions(result) {
+    return new Promise(resolve => {
+      let count = 0;
+      function drive(r) {
+        if (!r || !r.suspended) { resolve(count); return; }
+        count++;
+        const req = r.request;
+        const items = req && (req.items || req);
+        const op = items && items[0];
+        const opName = typeof op === 'string' ? op : (op && op.name) || String(op);
+        if (opName === 'io-sleep' || opName === 'wait') {
+          setTimeout(() => {
+            try { drive(r.resume(null)); }
+            catch(e) { console.error('  resume error:', e.message); resolve(count); }
+          }, 1);
+        } else { resolve(count); }
+      }
+      drive(result);
+    });
+  }
+
+  let pass = 0, fail = 0;
+  function assert(name, got, expected) {
+    if (got === expected) { pass++; console.log(`  ✓ ${name}`); }
+    else { fail++; console.error(`  ✗ ${name}: got ${got}, expected ${expected}`); }
+  }
+
+  // =====================================================================
+  // Test 1: SOURCE — load hs-repeat-times from .sx, call with perform
+  // =====================================================================
+  console.log('\n=== Test: SOURCE-loaded hs-repeat-times ===');
+
+  // Load from source
+  const hsFiles = ['tokenizer', 'parser', 'compiler', 'runtime'];
+  for (const f of hsFiles) {
+    K.load(fs.readFileSync(path.join(PROJECT_ROOT, 'lib/hyperscript', f + '.sx'), 'utf8'));
+  }
+
+  // Build handler and call it
+  K.eval(`(define _src-handler
+    (eval-expr
+      (list 'fn '(me)
+        (list 'let '((it nil) (event {:type "click"}))
+          (hs-to-sx-from-source "on click repeat 3 times add .active to me then wait 1ms then remove .active then wait 1ms end")))))`);
+
+  const srcMe = makeElement('button');
+  K.eval('(define _src-me (host-global "_srcMe"))');
+  global._srcMe = srcMe;
+  K.eval('(define _src-me (host-global "_srcMe"))');
+
+  let srcResult;
+  try { srcResult = K.callFn(K.eval('_src-handler'), [srcMe]); }
+  catch(e) { console.error('Source call error:', e.message); }
+
+  const srcSuspensions = await countSuspensions(srcResult);
+  assert('source: 6 suspensions (3 iters × 2 waits)', srcSuspensions, 6);
+
+  // =====================================================================
+  // Test 2: BYTECODE — load hs-repeat-times from .sxbc, call with perform
+  // =====================================================================
+  console.log('\n=== Test: BYTECODE-loaded hs-repeat-times ===');
+
+  // Reload from bytecode — overwrite the source-defined versions
+  if (K.beginModuleLoad) K.beginModuleLoad();
+  for (const f of ['hs-tokenizer', 'hs-parser', 'hs-compiler', 'hs-runtime']) {
+    const bcPath = path.join(SX_DIR, f + '.sxbc');
+    if (fs.existsSync(bcPath)) {
+      const bcSrc = fs.readFileSync(bcPath, 'utf8');
+      K.load('(load-sxbc (first (parse "' + bcSrc.replace(/\\/g, '\\\\').replace(/"/g, '\\"') + '")))');
+    }
+  }
+  if (K.endModuleLoad) K.endModuleLoad();
+
+  // Build handler with the bytecode-loaded hs-repeat-times
+  K.eval(`(define _bc-handler
+    (eval-expr
+      (list 'fn '(me)
+        (list 'let '((it nil) (event {:type "click"}))
+          (hs-to-sx-from-source "on click repeat 3 times add .active to me then wait 1ms then remove .active then wait 1ms end")))))`);
+
+  const bcMe = makeElement('button');
+  global._bcMe = bcMe;
+  K.eval('(define _bc-me (host-global "_bcMe"))');
+
+  let bcResult;
+  try { bcResult = K.callFn(K.eval('_bc-handler'), [bcMe]); }
+  catch(e) { console.error('Bytecode call error:', e.message); }
+
+  const bcSuspensions = await countSuspensions(bcResult);
+  assert('bytecode: 6 suspensions (3 iters × 2 waits)', bcSuspensions, 6);
+
+  // =====================================================================
+  // Test 3: Minimal — just hs-repeat-times + perform, no hyperscript
+  // =====================================================================
+  console.log('\n=== Test: Minimal repeat + perform ===');
+
+  // Source version
+  K.eval('(define _src-count 0)');
+  K.eval(`(define _src-repeat-fn
+    (fn (n thunk)
+      (define do-repeat
+        (fn (i) (when (< i n) (do (thunk) (do-repeat (+ i 1))))))
+      (do-repeat 0)))`);
+  K.eval(`(define _src-repeat-thunk
+    (eval-expr '(fn () (_src-repeat-fn 3 (fn () (set! _src-count (+ _src-count 1)) (perform (list 'io-sleep 1)))))))`);
+
+  let minSrcResult;
+  try { minSrcResult = K.callFn(K.eval('_src-repeat-thunk'), []); }
+  catch(e) { console.error('Minimal source error:', e.message); }
+  const minSrcSusp = await countSuspensions(minSrcResult);
+  const minSrcCount = K.eval('_src-count');
+  assert('minimal source: 3 suspensions', minSrcSusp, 3);
+  assert('minimal source: count=3', minSrcCount, 3);
+
+  // =====================================================================
+  // Summary
+  // =====================================================================
+  console.log(`\n${pass} passed, ${fail} failed`);
+  process.exit(fail > 0 ? 1 : 0);
+}
+
+main().catch(e => { console.error('FATAL:', e.message); process.exit(1); });