Bug 166941 - Implement writing-mode: sideways-rl; and sideways-lr;
Summary: Implement writing-mode: sideways-rl; and sideways-lr;
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Text (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL: https://www.w3.org/TR/css-writing-mod...
Keywords: InRadar
: 150820 208075 (view as bug list)
Depends on: 234689
Blocks: 150822
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Reported: 2017-01-11 14:01 PST by Myles C. Maxfield
Modified: 2022-02-03 04:43 PST (History)
8 users (show)

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Comment 1 Myles C. Maxfield 2017-01-11 14:07:15 PST
Hyatt says that we currently have the infrastructure to do this quite easily, so the bulk of the work would be to hook up the new properties.
Comment 2 Myles C. Maxfield 2017-01-11 14:11:11 PST
Hyatt says that these would probably best be implemented with two independent properties: one for line direction which could be rl, tb, and bt, and one for line orientation, which could be normal or flipped. Then writing-mode would be a shorthand for combining these two.
Comment 3 Myles C. Maxfield 2017-01-11 14:14:35 PST
Hyatt says 1-2 days of work
Comment 4 Gérard Talbot (gone) 2017-07-26 17:28:21 PDT
'sideways-rl' and 'sideways-lr' are at-risk in the latest CR spec 

https://www.w3.org/TR/css-writing-modes-3/#block-flow

and have been removed from the editor's draft

https://drafts.csswg.org/css-writing-modes-3/#block-flow

which lead me to say that supporting 'sideways-rl' and 'sideways-lr' is NOT required in order to claim compliance with CSS3 Writing Modes spec. In all fairness, P2 in this bug report does not seem justified in my opinion.
Comment 5 r12a 2020-06-23 04:14:55 PDT
Implementation of writing-mode: sideways-rl and sideways-lr is still needed.

People are regularly trying to achieve the desired result (and even teaching others to do it) using the other writing-mode properties, even though such an approach only works in extremely limited circumstances and may lead to breakage unless carefully controlled.

CSS Writing-modes 4 is in CR, and was this feature was split from level 3 in order to release what was already available for the benefit of CJK users, however the idea was that these values would be also implemented soon.

It's a feature that plenty of people will benefit from, so can we move up the implementation if it's so straightforward?  (It's already implemented by Gecko.)
Comment 6 Theresa O'Connor 2021-08-04 09:44:30 PDT
This is being tracked by the W3C I18N folk in https://github.com/w3c/eurlreq/issues/11
Comment 7 Radar WebKit Bug Importer 2021-08-04 09:44:44 PDT
<rdar://problem/81519211>
Comment 8 Tim Nguyen (:ntim) 2021-12-23 16:30:48 PST
*** Bug 150820 has been marked as a duplicate of this bug. ***
Comment 9 Tim Nguyen (:ntim) 2021-12-23 16:32:08 PST
This is now in writing-modes-4: https://www.w3.org/TR/css-writing-modes-4/#block-flow
Comment 10 Tim Nguyen (:ntim) 2021-12-25 08:03:14 PST
*** Bug 208075 has been marked as a duplicate of this bug. ***
Comment 11 Tim Nguyen (:ntim) 2021-12-25 10:16:50 PST
This needs splitting the concept of writing-mode from typographic mode in the WebKit code.
Comment 12 Tim Nguyen (:ntim) 2021-12-26 10:05:15 PST
Text direction (rtl/ltr) also needs to be decoupled from inline base direction.
Comment 13 Tim Nguyen (:ntim) 2021-12-26 16:11:39 PST
I started some work here: https://github.com/nt1m/webkit/tree/sideways-wm

sideways-rl is working well, sideways-lr is the harder one, since font-orientation needs to be rotated on the other side, in addition, inline direction is wrong atm.
Comment 14 r12a 2022-02-03 04:43:07 PST
W3C is tracking this bug report at https://github.com/w3c/eurlreq/issues/11