-
Notifications
You must be signed in to change notification settings - Fork 16
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Remove #textOrientation-sideways-LR. #980
Labels
Milestone
Comments
skynavga
added a commit
that referenced
this issue
Aug 26, 2018
skynavga
added a commit
that referenced
this issue
Aug 27, 2018
@skynavga I'm trying to understand why |
@nigelmegitt correct; as I said yesterday, neither UTR50 nor CSS WM3 define any use of CCW rotation, so it all uses of sideways map to 90CW |
skynavga
added a commit
that referenced
this issue
Sep 9, 2018
…ideways-lr Remove #textOrientation-sideways-LR and related semantics (#980).
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
The semantics of
sidewaysLeft
, specifically, a 90 degree counter-clockwise rotation, is not well defined in the context of vertical, top-to-bottom inline progression line layout. For example, rotating latin text 90 degrees counter-clockwise would effectively make it a bottom-to-top inline progression layout, which is not supported by any (currently) defined writing mode in TTML. Reviewing both UTR50 and CSS Writing Modes Level 3 reveals that in all cases, only 90 degree clockwise rotation is sanctioned.Since we have marked
#textOrientation-sideways-LR
as at-risk, I suggest we remove this feature, including the semantics ofsidewaysLeft
which appears to sanction a less than well-defined CCW rotation.Although this is a substantive change, it is permitted prior to PR without triggering a new CR since it has been marked at risk.
The text was updated successfully, but these errors were encountered: