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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <h2>Third paramater for setTimeout</h2>
  <button>Click Me</button>
  <output></output>
</body>
</html>
 
body {
  font-family: Arial, sans-erif;
}
output {
  display: block;
  padding: 10px;
}
 
let btn = document.querySelector('button'),
    op = document.querySelector('output');
btn.addEventListener('click', () => {
  op.innerHTML = 'Calculating...';
  let a = 5,
      b = 7;
  setTimeout(doSomething, 2000, a, b);
});
function doSomething (a, b) {
  op.innerHTML = a + b;
}
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