Brad Porter. <a href="http://www.w3.org/TR/2004/NOTE-modality-interface-20040510"><cite>Modality Component to Host Environment DOM Requirements and Capabilities Assessment.</cite></a> 10 May 2004. W3C Note. URL: <a href="http://www.w3.org/TR/2004/NOTE-modality-interface-20040510">http://www.w3.org/TR/2004/NOTE-modality-interface-20040510</a>