<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Ids and class </title>
</head>
<body>
<h1>Class and id in html</h1>
<!-- id is unique -->
<div id="st"></div>
<!-- class is not unique you give in multiple element -->
<div id="test" class="test1">
</div>
</body>
</html>
Thanks you for commenting your questions. I will see question and respond you.