Changes

* Similarly to the access of text, it is important to be able to access the structure of the multiplexed text through the Web page - in .* This is of particular importance for blind users that cannot use the mouse to access random offset points in videos but need to tab rely on tabbing.* Video (in particular video that has audio descriptions) needs to have a structure that can be accessed via tabbing through the content and cannot use it, to allow (blind) people to directly jump to areas of interestDiscussion:* (+) providing video with a mouse.structure for direct access to fragments is useful not just to blind people* (+) audio should also be able to be structured in this way