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The input form
attribute specifies the form the <input>
element belongs to.
The value of this attribute must be equal to the id attribute of the <form> element it belongs to.
<!DOCTYPE html>
<html>
<body>
<h1>The input form attribute</h1>
<p>The form attribute specifies the form an input element belongs to.</p>
<form method="post" action="/php/actionPagePost.php" id="form1">
<label for="fname">First name:</label>
<input type="text" id="fname" name="fname"><br><br>
<input type="submit" value="Submit">
</form>
<p>The "Last name" field below is outside the form element, but still part of the form.</p>
<label for="lname">Last name:</label>
<input type="text" id="lname" name="lname" form="form1">
</body>
</html>