4.2

The iTT (iTunes timed text) file format is a
subset of the Timed Text Markup Language,
Version 1.0
(TTML) from the
(W3C). All iTT documents are
TTML documents that use a restricted subset
of TTML. In addition to providing text and
timing, an iTT document specifies the font
style, font color, text alignment, and layout of
the timed text.
iTT subtitle format
W3C Candidate Recommendation
23 February 2010 World Wide
Web Consortium