Student-form/closure_demo.html at main · ankit271/Student-form · GitHub

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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>Closure</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">
</head>
<style>
    body {
        font-family: Helvetica, Arial, sans-serif;
        font-size: 12px;
    }

    h1 {
        font-size: 1.5em;
    }

    h2 {
        font-size: 1.2em;
    }

</style>
<body>
    <div>
        <p>Some paragraph text</p>
    <h1>some heading 1 text</h1>
    <h2>some heading 2 text</h2>
    </div>
    <div class="row" style="column-gap: 40px;">
        <button id="size-12" class="col-md-3 btn btn-primary">12</button>
        <button id="size-14" class="col-md-3 btn btn-primary">14</button>
        <button id="size-16" class="col-md-3 btn btn-primary">16</button>
    </div>

</body>
<script>
    function makeSizer(size) {
        return function () {
            document.body.style.fontSize = `${size}px`;
        };
    }

    const size12 = makeSizer(12);
    const size14 = makeSizer(14);
    const size16 = makeSizer(16);

    document.getElementById("size-12").onclick = size12;
    document.getElementById("size-14").onclick = size14;
    document.getElementById("size-16").onclick = size16;

</script>
</html>