Bug 260857

Summary:

Line break between Chinese/Japanese letters SHOULD be removed instead of replaced with a space

Product:

WebKit

Reporter:

Tatsunori Uchino <tats.u>

Component:

CSS

Assignee:

Nobody <webkit-unassigned>

Status:

NEW ---

Severity:

Normal

CC:

fantasai.bugs, Hironori.Fujii, karlcow, mmaxfield, webkit-bug-importer

Priority:

Keywords:

BrowserCompat, InRadar

Version:

Safari 15

Hardware:

All

OS:

All

Attachments:

Description	Flags
iOS Safari 15 preview of https://codepen.io/tats-u/pen/YzdKKyN	none
Windows Playwright WebKit 1811 http://wyw.dcweb.cn/ff3_lb.html	none
Firefox preview of https://codepen.io/tats-u/pen/YzdKKyN	none
Firefox preview of http://wyw.dcweb.cn/ff3_lb.html	none

Description Tatsunori Uchino 2023-08-29 06:45:04 PDT

Created attachment 467479 [details]
iOS Safari 15 preview of https://codepen.io/tats-u/pen/YzdKKyN

Firefox (OK): https://bugzilla.mozilla.org/show_bug.cgi?id=450088
Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=1473297

## What steps will reproduce the problem?

(1) See http://wyw.dcweb.cn/ff3_lb.html (referenced from the Firefox issue page) or https://codepen.io/tats-u/pen/YzdKKyN

## What is the expected result?

No extra spaces between Chinese / Japanese letters

## What happens instead?

Extra spaces are inserted into Chinese or Japanese sentences

## Please provide any additional information below. Attach a screenshot if
possible.

In Firefox,

- Newline between Chinese/Japanese and western/number/Korean => space
- Chinese/Japanese include CJK punctuation marks (e.g. 。、．，「」（）)

https://codepen.io/tats-u/pen/poQQVyR


CSS Text Module Level 4 (exists since Level 3):

https://drafts.csswg.org/css-text-4/#line-break-transform

See the EXAMPLE 19.

Comment 1 Tatsunori Uchino 2023-08-29 07:19:19 PDT

Created attachment 467480 [details]
Windows Playwright WebKit 1811 http://wyw.dcweb.cn/ff3_lb.html

Comment 2 Tatsunori Uchino 2023-08-29 07:21:54 PDT

Created attachment 467482 [details]
Firefox preview of https://codepen.io/tats-u/pen/YzdKKyN

No space inserted

Comment 3 Tatsunori Uchino 2023-08-29 07:24:47 PDT

Created attachment 467483 [details]
Firefox preview of http://wyw.dcweb.cn/ff3_lb.html

Comment 4 Fujii Hironori 2023-08-29 14:50:52 PDT

There are some tests in wpt/css/css-text/line-breaking.
https://wpt.fyi/results/css/css-text/line-breaking?label=experimental&label=master&aligned

Comment 5 Radar WebKit Bug Importer 2023-09-05 06:46:14 PDT

<rdar://problem/114978896>

Comment 6 Tatsunori Uchino 2023-09-08 23:47:44 PDT

The test cases beginning with segment-break-transformation- are related.

Comment 7 Tatsunori Uchino 2023-09-23 22:16:07 PDT

We have only to consider test cases starting with segment-break-transformation-rules-: https://wpt.fyi/results/css/css-text/line-breaking?label=master&label=experimental&aligned&q=segment-break-transformation-rules-