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+<!doctype html>
+<meta charset="utf-8">
+<title>18 native select option</title>
+<link rel="stylesheet" href="../_style.css">
+<script src="../_lib.js"></script>
+<body>
+<main>
+  <p>Goal: select the option <code>banana</code> from the native <code>&lt;select&gt;</code>.
+     Page asserts a real picker interaction: <code>mousedown</code>/<code>pointerdown</code>
+     on the &lt;select&gt; (opening the OS picker), then a <code>change</code> event with
+     <code>isTrusted=true</code>. Programmatically setting <code>.value</code> or clicking the
+     option element directly fails (clicking &lt;option&gt; does not change selection in
+     real browsers).</p>
+  <select id="s" style="font-size:18px;padding:6px 10px">
+    <option value="">— pick a fruit —</option>
+    <option value="apple">apple</option>
+    <option value="banana">banana</option>
+    <option value="cherry">cherry</option>
+  </select>
+</main>
+<script>
+Challenge.init({ id: "native-select", instructions: "pick 'banana' from native select" });
+const s = document.getElementById("s");
+
+let sawPointerDownOnSelect = false, pointerDownTrusted = false;
+s.addEventListener("pointerdown", (e) => { sawPointerDownOnSelect = true; pointerDownTrusted = e.isTrusted; });
+s.addEventListener("mousedown",  (e) => { sawPointerDownOnSelect = true; pointerDownTrusted ||= e.isTrusted; });
+
+// Trap: if a click bubbles up from an <option>, that's bot-like (real OS pickers don't dispatch this).
+s.addEventListener("click", (e) => {
+  if (e.target && e.target.tagName === "OPTION") {
+    Challenge.fail("click event with target=<option> bubbled to <select> (synthetic option click)");
+  }
+});
+
+let changeTrusted = false;
+s.addEventListener("change", (e) => {
+  changeTrusted = e.isTrusted;
+  Challenge.log("change", { v: s.value, isTrusted: e.isTrusted });
+  if (s.value !== "banana") return Challenge.fail(`selected="${s.value}" (need 'banana')`);
+  const bad = [];
+  if (!changeTrusted) bad.push("change event isTrusted=false");
+  if (!sawPointerDownOnSelect) bad.push("no pointerdown/mousedown on <select> before change");
+  if (!pointerDownTrusted) bad.push("pointerdown on select isTrusted=false");
+  if (bad.length) Challenge.fail(...bad);
+  else Challenge.pass("native picker opened and trusted change fired");
+});
+
+// Also trip if value mutates without change firing.
+let changed = false;
+s.addEventListener("change", () => { changed = true; });
+setInterval(() => {
+  if (s.value === "banana" && !changed) Challenge.fail("value='banana' without any change event");
+}, 200);
+</script>
+</body>