C:/xampp/htdocs/moodle/lib/form/passwordunmask.php

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<?php
if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    
}

global $CFG;
require_once($CFG->libdir.'/form/password.php');

class MoodleQuickForm_passwordunmask extends MoodleQuickForm_password {

    function MoodleQuickForm_passwordunmask($elementName=null, $elementLabel=null, $attributes=null) {
        global $CFG;
        if (empty($CFG->xmlstrictheaders)) {
            // no standard mform in moodle should allow autocomplete of passwords
            // this is valid attribute in html5, sorry, we have to ignore validation errors in legacy xhtml 1.0
            if (empty($attributes)) {
                $attributes = array('autocomplete'=>'off');
            } else if (is_array($attributes)) {
                $attributes['autocomplete'] = 'off';
            } else {
                if (strpos($attributes, 'autocomplete') === false) {
                    $attributes .= ' autocomplete="off" ';
                }
            }
        }
        parent::MoodleQuickForm_password($elementName, $elementLabel, $attributes);
    }

    function toHtml() {
        global $PAGE;

        if ($this->_flagFrozen) {
            return $this->getFrozenHtml();
        } else {
            $unmask = get_string('unmaskpassword', 'form');
            //Pass id of the element, so that unmask checkbox can be attached.
            $PAGE->requires->yui_module('moodle-form-passwordunmask', 'M.form.passwordunmask',
                    array(array('formid' => $this->getAttribute('id'), 'checkboxname' => $unmask)));
            return $this->_getTabs() . '<input' . $this->_getAttrString($this->_attributes) . ' />';
        }
    } //end func toHtml

}