<!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>