Question regarding semantics of "text position"

I am new to WebVTT and trying to go through the Draft Community Group
Specification (dated 23 August 2013) for WebVTT. This can be found at:

https://dvcs.w3.org/hg/text-tracks/raw-file/default/webvtt/webvtt.html

i am not sure if this is the correct forum for this but thought i would ask
the following question that pertains to the semantics of "text position".

Essentially, i noticed the following statement in the document in Section
3.1/"A writing direction":

A. "If the writing direction is horizontal, then line position percentages
are
relative to the height of the video, and text position and size percentages
are
relative to the width of the video."

A little bit further down in the same section/"A text position", i noticed
the following:

B. "A number giving the position of the text within the cue box. If the cue
is
not within a region, the value is to be interpreted as a percentage of the
box's size, otherwise as a percentage of the region width."

Going through (A) and (B), it appears that the interpretation of text
position percentage is different between the above two statements when size
is not equal to 100% (assuming regions are not used)

Am i missing something here? What are the correct semantics?

Thanks in advance!

-- 



Best regards,
Rohit Puri
(rpuri@netflix.com)