HTML <fieldset> Tags group related elements within a form

<fieldset> tags Package a portion of the form's content to generate a field for a set of related forms.

When a set of form elements is placed inside the <fieldset> tag, the browser displays them in a special way, they may have special boundaries, 3D effects, or even create a sub-form to process the elements.

The <fieldset> tag does not have a required or unique attribute.

The <legend> tag defines the caption for the fieldset element.

Differences between HTML 4.01 and HTML 5

HTML5 has the following properties: These properties are not supported in disabled, form, name,html 4.01.

Property

Properties	value	Description
Disabled	Disabled	Specifies that fieldset should be disabled.
Form	form_id	Specifies one or more forms to which fieldset belongs.
Name	Value	Specifies the name of the fieldset.

Instance:

<! DOCTYPE html>    Height:<input type="text" />     Weight:<input type=" text " />  </fieldset></form><p> If there is no border around the form, your browser is too old. </p></body>
The effect is as follows:
HTML <fieldset> Tags group related elements within a form