Let's see following example to understand about fieldset.
-----------------------------------------------------------------------------------
<html><!--root tag-->
<head><!--used for meta tag-->
<title><!--title tag-->
form with input tag date-time-local tag
</title>
</head>
<body><!--is a container-->
form <br>
<form><!--opening of form tag-->
<!--following script is related to fieldset-->
<fieldset>
<legend align="left">enter your personal information</legend>
<!--legend is for title of information-->
<label for="fname">First name</label><br>
<!--defines title-->
<input type="text" name="fname"><br>
<!--creates box-->
<label for="address">Address</label><br>
<!--defines title-->
<input type="text" name="address"><br>
<!-- creates box-->
<label for="email">e-mail</label><br>
<!--defines title-->
<input type="email" name="email">
<!--creates box to accept email.-->
</fieldset>
</form>
</body>
</html>
