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