Onextra follows the following best practices.
DV Best Practices Guide -http://nbviewer.jupyter.org/github/a11yofficer/dvbp/blob/master/PP_Described_Video_Best_Practices.pdf
Live Description best practices Guide - https://github.com/a11yofficer/dvbp/raw/master/Live_Described_Video_Best%20Practices.pdf
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67 Mowat Avenue
Suite 335
Toronto, Ontario
M6K 3E3
Email. info@onextra.ca