11-Event--keycodes

html

<!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">
    <link rel="stylesheet" href="./style.css">
    <title>Document</title>
</head>
<body>
    <div id="insert">
        <div class="key">
            Press any key to get the keyCode
        </div>
    </div>
    <script src="./script.js"></script>
</body>
</html>

css

@import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

* {
  box-sizing: border-box;
}

body{
    background-color: #e1e1e1;
    font-family: 'Muli',sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

.key{
    border: 1px solid #999;
    background-color: #eee;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
    display: inline-flex;
    align-items: center;
    font-size: 20px;
    font-weight: bold;
    padding: 20px;
    margin: 10px;
    min-width: 150px;
    position: relative;
}

.key small{
    position: absolute;
    top: -24px;
    left: 0;
    text-align: center;
    width: 100%;
    color: #555;
    font-size: 14px;
}

@media(max-width:768px){
    .key{
        margin: 10px 0px;
    }
}

const insert = document.getElementById('insert')

window.addEventListener('keydown',(event)=>{
    insert.innerHTML=`
    <div class="key">
    ${event.key === ' ' ? 'Space' : event.key}
    <small>event.key</small>
    </div>

    <div class="key">
        ${event.keyCode}
        <small>event.keyCode</small>
    </div>

    <div class="key">
        ${event.code}
        <small>event.code</small>
    </div>

    `
})