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The form attribute specifies the element belongs to one or more forms.
The owner of the element will indicate the form.

Syntax for form attribute in HTML:

<element form="form_id">

Differences between HTML 4.01 and HTML5 for form attribute:

HTML 4.01

The form attribute does not support in HTML4.

HTML 5

HTML5 support form attribute.

Applies To:

Elements	Attribute
<button>	form
<fieldset>	form
<input>	form
<keygen>	form
<label>	form
<meter>	form
<object>	form
<output>	form
<select>	form
<textarea>	form

Attribute Values:

Value	Description
form_id	Defines the form element belongs to the some of the tags. The value of this attribute must be the id attribute of a <form> element in the same document.

Sample Coding for form Attribute in HTML:

Tryit<!DOCTYPE html>
<html>
        <head>
        <title>Wikitechy form attribute</title>
        </head>
 <body>
        <form action="form.html" id="form_1">
        Firstname:<input type="text" name="fname"> <br>
        <input type="submit" value="Submit">
        </form>
        <p>Lastname:<input type="text" name="lname" form="form_1">
        </p>
</body>
</html>

Code Explanation for form Attribute in HTML:

The <form> tag is used to define a form with input elements.
Id attribute is used to define the <form> tag id as “form_1”.
The form attribute is used to append the <inputt> tag to the form which has the id attribute as “form_1”.
The type=”submit”is used to submit the form-data When the user click the submit button.

Output for form Attribute in HTML:

The Firstname text box is used to type a person’s first name.
The submit button, is used to submit the person’s name to the form.
The Lastname text box is used to type a person’s last name.

When the user c <form> tag but that will be also submitted because of “form” attribute.

Browser Support for form Attribute in HTML:

Elements
button	10	No	4	5.1	9.5
fieldset	No	No	No	No	No
input	9	No	4	5.1	10.6
keygen	Yes	No	Yes	6	Yes
label	Yes	Yes	Yes	Yes	Yes
meter	No	No	No	No	No
object	No	No	No	No	No
output	Yes	Yes	Yes	Yes	Yes
select	Yes	No	Yes	Yes	Yes
textarea	Yes	No	Yes	Yes	Yes

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