Put all the bugs and enhancements related to text direction here.
Steps to Reproduce:
User Profile Reset: No
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:51.0) Gecko/20100101 Firefox/51.0
UTR No.50 Unicode Vertical Text Layout will become an appendix of the Unicode Standard since version 10.0, so we should give better support to responce