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Full Code Used in This Demo
HTML
<button id="btnClick">Click</button>
<div id="box">Hover me</div>
<input id="keyInput">
<form id="demoForm">...</form>
CSS
#box { height: 80px; border-radius: 8px; }
JavaScript
document.getElementById('btnClick').addEventListener('click', () => {
document.getElementById('outClick').textContent = 'Clicked!';
});