A leap year program that I wrote using JavaScript programming language. I hope you will find my work useful.

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Leap Year in JavaScript</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #AAAF99;
            color: #000;
            font-family: sans-serif;
        }
        main {
            padding: 50px;
            border-radius: 10px;
            background-color: #fff;
            min-width: 500px;
        }
        h1 {
            margin-bottom: 5px;
            font-size: 28px;
            text-align: center;
        }
        h2 {
            margin-bottom: 30px;
            font-size: 20px;
            text-align: center;
        }
        .block {
            margin: 0 auto 12px;
            display: flex;
            align-items: center;

        }
        label {
            display: block;
            width: 35%;
            line-height: 40px;
            background-color: #2F4C58;
            color: #eee;
            text-align: center;
        }
        input {
            padding: 10px;
            width: 65%;
            font-size: 14px;
            border-radius: 0 5px 5px 0;
            border: 2px solid #000;
            outline: none;
        }
        .btnBlock {
            display: flex;
            width: 100%;
        }
        .btn {
            display: inline-block;
            padding: 15px;
            background-color: #63A583;
            color: #fff;
            outline: none; 
            border: none;
            cursor: pointer;
            width: 150px;
            width: 50%;
            font-size: 16px;
            text-decoration: none;
            text-align: center;
            transition: all .2s;
        }
        .btnReset {
            background-color: #6E93D6;
        }
        .btn:hover {
            opacity: 0.9;
        }
        .average {
            display: block;
            width: 100%;
            margin-top: 12px;
            padding: 20px 0;
            background-color: #2F4C58;
            font-size: 16px;
            text-align:center;
            color: #f3f3f3;
        }
        .hide {
            display: none;
        }
    </style>
</head>
<body>
    <main class="container">
        <h1>LEAP YEAR IN JAVASCRIPT</h1>
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <form action="" id="frmCalc">
            <div class="block">
                <label for="val_num">Give a Year</label>
                <input type="number" id="val_num" autofocus required>
            </div>
           
            <div class="btnBlock">
                <button type="submit" class="btn">SUBMIT</button>
                <a href="" class="btn btnReset">RESET</a>
            </div><br>
            <div class="display_result hide"></div>
        </form>
    </main>

    <script>

       document.querySelector('#frmCalc').onsubmit  = (e) => {
            e.preventDefault()
            let i=0, chk=0;
            let display = document.querySelector('.display_result'),
               arr = document.getElementById("val_num");
                num_year = 0;
                num_year = parseInt(arr.value);
                 
 //three conditions to find out the leap year
    if ((0 == num_year % 4) && (0 != num_year % 100) || (0 == num_year % 400)) {
        result = num_year  + " is a Leap Year.";
    } else {
        result = num_year  + " is Not a Leap Year.";
    }

            display.classList.remove('hide');
            display.innerHTML = "<h1>" + result + "</h1>";
      }
    </script>
</body>
</html>
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