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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Js</title>
<!-- <script src="index.js"></script> -->
<!-- <link rel="stylesheet" href="style.css"> -->
<script src="closure.js"></script>
<style>
body{
font-size: 18px;
text-align: center;
}
</style>
</head>
<body>
<h2>Welcome to Javascript.</h2>
closures.
<hr>
<button id="first">size 12</button>
<button id="second">size 13</button>
<button id="third">size 14</button>
</body>
</html>
<!-- <script src=""></script> -->
<script>
// alert("Document")
function makesizer(size) {
return function(){
document.body.style.fontSize = `${size}px`
}}
const size12 = makesizer(10)
const size13 = makesizer(14)
const size14 = makesizer(18)
document.getElementById('first').onclick = size12;
document.getElementById('second').onclick = size13;
document.getElementById('third').onclick = size14;
</script>