1951795 - [css-text-4] Implement text-spacing-trim property

Status: NEW

(Core :: Layout: Text and Fonts, enhancement)

Description

[Sebastian Zartner [:sebo]]

The CSS Text Module Level 4 defines a text-spacing-trim property that controls spacing around CJK punctuation characters on the same line.
It is a longhand for the text-spacing property, which is meant to be implemented in bug 289130.

This bug is meant to implement that property.

Sebastian

Comment 1

[Jonathan Kew [:jfkthame]]

For additional background, see also https://www.w3.org/International/jlreq/gap-analysis/#issue182_glyphs and https://www.w3.org/International/jlreq/gap-analysis/#issue181_glyphs.

Comment 2

[Tatsunori Uchino]

Yu Gothic UI (system-ui for Japanese Windows) must be explicitly excluded from this specification for the time being.

Comment 3

[Celeste Liu [:Coelacanthus]]

(In reply to Tatsunori Uchino from comment #2)

Yu Gothic UI (system-ui for Japanese Windows) must be explicitly excluded from this specification for the time being.

Which issue does this font have? Broken halt feature?

Comment 4

[Tatsunori Uchino]

Yes, its GPOS table and halt is completely rotten and broken.

https://github.com/w3c/csswg-drafts/issues/11074

Comment 5

[Tatsunori Uchino]

We have to apply a provisional patch like:

https://chromium-review.googlesource.com/6831235
https://github.com/chromium/chromium/commit/884a87eca099f473d635911b9c7c89441c46feb2

Comment 6

[Tatsunori Uchino]

Yu Gothic UI has just been fixed by the latest monthly KB. You do not need a patch any longer.

Comment 7

[Tatsunori Uchino]

I prepared a test case: https://codepen.io/tats-u/pen/QwEWwEq (Note: It will try to download Source Han Sans VF .woff2 (which is 14MB))

Comment 8

[Tatsunori Uchino]

Update: the CSS spec needs to be updated to satisfy some of the above test cases.
At least making the display match Chromium-based browsers would be the first milestone.