Description: ------------ Currently, it's not possible to add an "Alt" attribute in the image tag. In the chass HTML_QuickForm_CAPTCHA_Image function toHtml() { .... $html = $tabs.'<a href="'.$this->_options['callback'] .'" target="_blank" ' .$this->_getAttrString($attr) .' onclick="var cancelClick = false; ' .$this->getOnclickJs($imgName) .' return !cancelClick;"><img src="' .$this->_options['callback'].'" name="'.$imgName .'" id="'.$imgName.'" width="'.$this->_options['width'] .'" height="'.$this->_options['height'].'" title="' .htmlspecialchars($this->_options['alt']).'" /></a>'; ... } $this->_options['alt'] is only used for the attribute "title". Could you please add the tag "alt". To be xhtml 1.0 compliant the attribute "alt" must be specified in the tag "img". Thanks Test script: --------------- $options = array( 'alt' => 'test', 'width' => 205, 'height' => 80, 'output' => 'png', 'callback' => ... ); Expected result: ---------------- <img id="QF_CAPTCHA_captcha_question" height="80" width="205" title="test" alt="test" name="QF_CAPTCHA_captcha_question" src="qfcaptcha_image.php?var=Compte.class"/> Actual result: -------------- <img id="QF_CAPTCHA_captcha_question" height="80" width="205" title="test" name="QF_CAPTCHA_captcha_question" src="qfcaptcha_image.php?var=Compte.class"/>