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There should be a link to the region part when the region is mentioned. As per feedback from Andreas Tai: http://lists.w3.org/Archives/Public/public-texttracks/2015Feb/0005.html
https://github.com/w3c/webvtt/pull/176
Patch applied.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=28074
Thanks for resolving this issue.