See [1] for additional background on this feature.
We are aiming to enable support for CSS writing-mode and related
features (i.e. vertical text support) in Gecko 39.[2]
This will be enabled behind an #ifndef RELEASE_BUILD condition, so that
for the time being, these features will be available by default in
developer builds, but not in the release version.
Once more key parts of CSS layout have been adapted to support vertical
mode, we'll remove the condition and enable writing-mode by default on
release as well as dev channels.[3]
cc'ing firefox-dev and dev-gaia lists, particularly to make people aware
that while we encourage experimentation with the new properties (please
test and file bugs!), you should not attempt to use them in front-end
code that will ship to release channels where writing-mode remains
disabled-by-default for now.
JK
[1]
https://www.mail-archive.com/dev-platform@lists.mozilla.org/msg12343.html
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1099032
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=1138384
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