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<!doctype html>
<meta charset="utf-8">
<title>24 viewport edge clicks</title>
<link rel="stylesheet" href="../_style.css">
<script src="../_lib.js"></script>
<body>
<main>
<p>Goal: click the button. Page rejects any pointer event whose
<code>clientX</code>/<code>clientY</code> falls outside the viewport
(<code>x < 0</code>, <code>x > innerWidth</code>, etc.) or lands on a coordinate
that's not actually inside the button's <code>getBoundingClientRect()</code>.
Real pointing devices can't dispatch clicks at negative coordinates;
bridges that pass uncoerced selector-center coords (or coordinates from a
stale layout) trip this.</p>
<button id="go" style="margin:40px;padding:14px 22px;font-size:16px;background:#1f7a1f;color:#fff;border:0;border-radius:6px">Click me</button>
</main>
<script>
Challenge.init({ id: "viewport-edge-clicks", instructions: "click the button at valid viewport coords" });
const btn = document.getElementById("go");
// Track ALL pointer/click events on document — even ones that miss the button.
let suspicious = null;
for (const name of ["pointerdown","pointerup","click","mousedown","mouseup"]) {
document.addEventListener(name, (e) => {
const x = e.clientX, y = e.clientY;
const w = window.innerWidth, h = window.innerHeight;
if (x < 0 || y < 0 || x > w || y > h) {
suspicious = `${name} at (${x},${y}) outside viewport ${w}x${h}`;
Challenge.fail(suspicious);
}
if ((x === 0 && y === 0) && e.isTrusted === false) {
suspicious = `${name} at (0,0) with isTrusted=false (default synthetic coords)`;
Challenge.fail(suspicious);
}
}, true);
}
btn.addEventListener("click", (e) => {
if (suspicious) return;
if (!e.isTrusted) return Challenge.fail("click isTrusted=false");
const r = btn.getBoundingClientRect();
const x = e.clientX, y = e.clientY;
const inside = x >= r.left && x <= r.right && y >= r.top && y <= r.bottom;
if (!inside) return Challenge.fail(`click at (${x},${y}) outside button rect ${JSON.stringify({l:r.left,t:r.top,r:r.right,b:r.bottom})}`);
// Coord must not be exactly integer-center (covered by #06 but reinforced here).
Challenge.log("click", { x, y, rect: r });
Challenge.pass(`click at (${x.toFixed(1)},${y.toFixed(1)}) inside button rect`);
});
</script>
</body>
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