Accessibility

Inherited from HTML.

<img src="logo"
        title="W3C Logo" 
        alt="This is an image of W3C logo"
        longdesc="http://www.w3.org/logo_description">
        

Providing more informations with captions

<switch>
   <text-stream src="joe-caption" system-captions="on"/>
   <audio src="joe-audio"/>
</switch>