id and classes in html.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">
    <title>ID and classes in html</title>
</head>

<body>
    <h3>id and classes in html</h3>
    <div id="mainBox" class="redBg"></div>
    <!--Emmet(shourtcut to write)-->
    <!--Emmrt takes div takes as defailt-->
    <div class="blackground"></div>
    <div id="mainbox"></div>
    <!--creating multiple elements using Emmet-->
    <!-- span.myclass.myclass2.myclass3*3  (to print 3 similar using emmet ) -->
    <span class="myclass myclass2 myclass3">first</span>
    <span class="myclass myclass2 myclass3">second</span>
    <span class="myclass myclass2 myclass3">third</span>
    <p>Empty character is written is like this &#8203;</p>

</body>

</html>