Accessibility/TimedText

Resources relating to W3C TimedText

head - body - separated document
div, p and span elements to structure content; they all have begin, end and duration attributes;
a "region" element defines the area into which the text is to be rendered; multiple regions can be displayed at the same time and they can spatially overlap
a "style" element defines a style for a region
the region is then referred to from an div, p, or span element to define where and how to render the text
a "layout" element groups metadata and regions
had dynamic text display through dynamic flow style
SMIL 2.1 based "set" element to control the animation of some other element
SMIL 2.1 based "timeContainer" specification to specify local sequential or parallel child elements
metadata specification possible in Dublin Core style

This specification defines the subpart of the DFXP authoring language that is supported on 3GPP and how it maps into the 3GPP file format.

each timed text track defines a region with width, height, translation
within the region is defined a text box set into which captions are rendered
styling is applied to the region and/or the text box(es)
there is a "layer" value that decides between timed text tracks and video tracks the order of display layers
i18n is achieved with language spec, writing direction, and character set support
marquee-scrolling (ticker scrolling) is defined through scroll-in, scroll-out, scroll-delay attributes, scroll speed depends on the duration of this text segment
dynamic highlighting as in Karaoke or Closed Captions is mentioned
soft text wrap from line to line is supported to fit text within a text box
outgoing hyperlinks are supported by attributing them to text boxes
media mapping is defined for MPEG-4