[ttml2] Create a section on options for customisation

nigelmegitt has just created a new issue for 
https://github.com/w3c/ttml2:

== Create a section on options for customisation ==
As per 
[Action-460](https://www.w3.org/AudioVideo/TT/tracker/actions/460), 
and recorded in [these 
minutes](https://www.w3.org/2016/04/07-tt-minutes.html#action01), add 
a section to TTML2 explaining the options for customisation, including
 as a minimum:

-  deliberate non-compliance of presentation processors with the 
specification; 
-  local setting of implementation dependent values such as default 
value for `tts:color` etc.; 
-  use of parameters and conditions to control styling for using.

This will also serve as a placeholder for any other mechanisms that we
 introduce for customisation.

Please view or discuss this issue at 
https://github.com/w3c/ttml2/issues/156 using your GitHub account

Received on Tuesday, 12 April 2016 16:26:12 UTC