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diff --git a/test-suite/challenges/41-tab-lifecycle.html b/test-suite/challenges/41-tab-lifecycle.html
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+<!doctype html>
+<meta charset="utf-8">
+<title>41 tab lifecycle</title>
+<link rel="stylesheet" href="../_style.css">
+<script src="../_lib.js"></script>
+<body>
+<main>
+  <p>Goal: create a new tab, inspect it, close it, return to parent, then verify lifecycle state.</p>
+  <p id="msg"></p>
+  <button id="verify">Verify tab lifecycle</button>
+</main>
+<script>
+Challenge.init({ id: "tab-lifecycle", instructions: "new tab → inspect child → close child → return parent → Verify" });
+const qs = new URLSearchParams(location.search);
+const key = "pi-chrome-suite:tab-lifecycle:state";
+function readState(){ try { return JSON.parse(localStorage.getItem(key) || "{}"); } catch { return {}; } }
+function replaceState(next){ localStorage.setItem(key, JSON.stringify({ ...next, ts: Date.now() })); }
+function writeState(patch){ localStorage.setItem(key, JSON.stringify({ ...readState(), ...patch, ts: Date.now() })); }
+
+if (qs.get("child") === "1") {
+  document.title = "[CHILD] 41 tab lifecycle";
+  document.getElementById("msg").textContent = "Child tab opened. Close this tab, then return to parent.";
+  writeState({ opened: true, childUrl: location.href, childTitle: document.title });
+  window.addEventListener("pagehide", () => writeState({ closed: true, closedAt: Date.now() }));
+  window.addEventListener("beforeunload", () => writeState({ closed: true, closedAt: Date.now() }));
+  // Do not call Challenge.pass here: parent verification must be the only suite PASS.
+  Challenge.log("child-loaded", { url: location.href });
+} else {
+  document.getElementById("msg").textContent = "Parent tab. Runner should open this same file with ?child=1 in a new tab, inspect it, close it, then return here.";
+  replaceState({ parentLoaded: true, closed: false });
+  document.getElementById("verify").addEventListener("click", (e) => {
+    const s = readState();
+    const bad = [];
+    if (!e.isTrusted) bad.push("verify click isTrusted=false");
+    if (!s.opened) bad.push("child tab did not record opened=true");
+    if (!s.childUrl || !s.childUrl.includes("child=1")) bad.push("child URL not recorded");
+    if (!s.closed) bad.push("child tab close/pagehide was not recorded");
+    Challenge.log("tab-state", s);
+    if (bad.length) Challenge.fail(...bad);
+    else Challenge.pass("new/inspect/close/return tab lifecycle completed");
+  });
+}
+</script>
+</body>