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<h1>Hello world</h1> <button id="btn">Click me</button>
body { font-family: sans-serif; padding: 20px; } button { padding: 10px 20px; background: #38bdf8; border: none; border-radius: 6px; color: white; }
document.addEventListener("DOMContentLoaded", () => { const btn = document.getElementById("btn"); if (btn) btn.onclick = () => alert("Hello from JS!"); });
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