form Attribute

The form attribute specifies one or more forms the input field belongs to.

Note: The form attribute works with all types.

The form attribute must refer to the id of the form it belongs to:

<form action="demo_form.asp" method="get" id="user_form">
First name: <input type="text" name="fname" />
<input type="submit" />
</form>
Last name: <input type="text" name="lname" form="user_form" />

Note: To refer to more than one form, use a space-separated list.