The orientation of characters in vertical flow is defined in Unicode UTR#50[1].

Characters for Mongolian and Phags-Pa scripts were changed to R (rotate)
from U (upright) in rev 13 of the Unicode UTR#50[1], the specification of
character orientations in vertical flow. CSS Writing Modes Level 3 refers
this specification to use in vertical flow[2].

[1] http://www.unicode.org/reports/tr50/
[2] http://dev.w3.org/csswg/css-writing-modes/#vertical-orientations


BUG=397856
TEST=fast/writing-mode/text-orientation-mongolian-phagspa.html

Review URL: https://codereview.chromium.org/755343005

git-svn-id: svn://svn.chromium.org/blink/trunk@187185 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed