input-group example form

inputgroup_example_form.php

<?php

function inputgroup_example_form($form,&$form_state) {
	$form = array();
	
	$form['i'] = array(
		'#type' => 'textfield',
		'#attributes' => array(
			'placeholder' => 'input-groups in drupal!',
		),
		'#input_group' => TRUE,
		'#field_prefix' => "&lt;/&gt;",
	);
	
	return $form;
}