1957317 - Update CJKT default fonts to Noto Sans CJK

Status: RESOLVED FIXED

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

Description

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Chrome started using Noto Sans CJK for the default font on Windows if it's installed and Windows 10/11 has or will have the font by default. So at least in the future, we need to follow them for web-compat, but I'm not sure when it's the best because I saw some complains about the rendering result with new fonts.

See also https://zenn.dev/15/articles/d6516675dac2dc (written in Japanese), so, at least after shipping text-box-trim?

Comment 1

[Masataka Yakura [:myakura]]

Attachment: Noto Sans JP on Windows 11

See also https://zenn.dev/15/articles/d6516675dac2dc (written in Japanese)

(off-topic) the article says the fonts are not variable fonts, but they are.

Comment 2

[Makoto Kato [:m_kato]]

https://docs.google.com/document/d/1q-rK_0C1_6mK39Vfa3pFXMQUvg05sUO-DYOygZek6vg is a design doc for decision of CJK fonts.

Comment 3

[u772416]

Windows 10/11 added Noto fonts (Sans and Serif) for CJK users in 2025-03 D patch, and Microsoft Edge/Google Chrome browser now defaults to them. Time to change in Firefox.

Comment 4

[u772416]

Attachment: all.js patch

Comment 5

[Alice0775 White]

FWIW,
on Windows11, Microsoft installed Noto Sans JP and Noto Serif JP.
However, on Windows10, Microsoft installed Noto Sans JP, but not Noto Serif JP.

Comment 6

[u772416]

(In reply to Asagi Mutsuki from comment #3)

Windows 10/11 added Noto fonts (Sans and Serif) for CJK users in 2025-03 D patch, and Microsoft Edge/Google Chrome browser now defaults to them. Time to change in Firefox.

Chromium updated CJK default fonts in 06/2024 https://source.chromium.org/chromium/chromium/src/+/3ae0858daf3a68dfb7926691b8f403563b002b32

Comment 7

[Ōtsu Shumpei]

(In reply to Asagi Mutsuki)
I had a look at the patch as a user.
Would you consider making BIZ UDGothic the first choice for font.name-list.monospace.ja, to better align with Chrome’s default?

Comment 8

[u772416]

Attachment: all.js 19/05/24 patch

Make CJKT fonts the same as Chromium.

Comment 9

[u772416]

(In reply to Ōtsu Shumpei from comment #7)

(In reply to Asagi Mutsuki)
I had a look at the patch as a user.
Would you consider making BIZ UDGothic the first choice for font.name-list.monospace.ja, to better align with Chrome’s default?

fix it

Comment 10

[Takanori MATSUURA]

Comment on attachment 9488568 [details]
all.js 19/05/24 patch

Changed the content type because this is not a patch.

Comment 11

[Ōtsu Shumpei]

Attachment: Update CJKT default fonts to Noto series on Windows

Attached the patch version of all.js changes from 19/05/24, replacing the full source upload.

Comment 12

[Jonathan Kew [:jfkthame]]

I've pushed a try run at https://treeherder.mozilla.org/jobs?repo=try&landoCommitID=137652 with a patch to update these prefs (based on comment 11, with some adjustments); let's see how much it disrupts existing reftests. (I suspect there'll be some impact, though it may well be harmless -- just fragile tests.)

Comment 13

[Jonathan Kew [:jfkthame]]

Attachment: Bug 1957317 - Update Windows font prefs to use Noto CJK fonts by default if available. r=#layout

Comment 14

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/9b292b71f363
https://hg.mozilla.org/integration/autoland/rev/8b79f567cf2d
Update Windows font prefs to use Noto CJK fonts by default if available. r=layout-reviewers,emilio

Comment 15

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/8b79f567cf2d

Comment 16

[Kagami Rosylight [:saschanaz] (they/them)]

Noto Sans is bad at traditional 96DPI displays, we should track whether this causes significant visual regression for users with older machines.