2014703 - Enable font-family: math by default

Status: RESOLVED FIXED

(Core :: MathML, task)

Comment 1

[Frédéric Wang Nélar]

Attachment: Bug 2014703 - Enable font-family: math by default. r=emilio

Intent to ship email: ...

Comment 2

[Pascal Chevrel:pascalc]

Please request an addition to release notes once this is landed, thanks.
https://wiki.mozilla.org/Release_Management/Release_Notes_Nomination

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/efdc411bb3a0
https://hg.mozilla.org/integration/autoland/rev/66f00a856d7f
Enable font-family: math by default. r=emilio

Comment 4

[Frédéric Wang Nélar]

Release Note Request (optional, but appreciated)
[Why is this notable]: New value for the CSS font-family property, affecting MathML.
[Affects Firefox for Android]: Yes.

[Suggested wording]: The math value of the CSS font-family is now supported and used by default for MathML's <math> element. It enables Web developers to indicate special fonts with advanced math features should be used. Firefox will rely on the serif font for mathematics in the preference (either via the settings menu or via the font.name-list.serif.x-math preference in about:config).

[Links (documentation, blog post, etc)]:
MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/font-family#math
Eri's blog post: https://conflor.es/blog/2025-11-27-interop-and-mathml/
Eri's presentation at FOSDEM: https://fosdem.org/2026/schedule/event/NJM3KB-mathml-core/

Comment 5

[Pascal Chevrel:pascalc]

Note added to nightly release notes with this wording:

The math value of the CSS font-family is now supported and used by default for MathML's <math> element. It enables Web developers to indicate special fonts with advanced math features should be used. Firefox will rely on the serif font for mathematics defined in Firefox preferences.

I am keeping the relnote-firefox? flag set until we include this note in out final 149 release notes, thanks.

Comment 6

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/66f00a856d7f

Comment 8

[Hamish Willee]

FF149 MDN work for this can be tracked in https://github.com/mdn/content/issues/43209