[i18n-activity] support scrolling for vertically rendered text

r12a has just created a new issue for 
https://github.com/w3c/i18n-activity:

== support scrolling for vertically rendered text ==
https://github.com/w3c/webvtt/issues/316

Please view or discuss this issue at 
https://github.com/w3c/i18n-activity/issues/237 using your GitHub 
account

Received on Friday, 21 October 2016 10:25:54 UTC