1385555 - @font-face on gcc.godbolt.org for Fira Mono shows proportional serif font

Status: RESOLVED DUPLICATE of bug 1331797

(Core :: Graphics: Text, defect)

Description

[Lars Viklund]

Attachment: godbolt-font-nightly.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0
Build ID: 20170728100358

Steps to reproduce:

Navigate to the Compiler Explorer at https://gcc.godbolt.org/ using both
* Nightly 56.0a1 (2017-07-28) (64-bit), and
* released Firefox 54.
Look at and compare the text editors and panes.


Actual results:

Note that they are not using the Fira Mono font the CSS requests via @font-face in Nightly.
The CSS and a WOFF2 are fetched with 200 OK status.


Expected results:

The Fira Mono font should render instead of some serif proportional font.

Comment 1

[Lars Viklund]

Attachment: godbolt-font-release.png

Comment 2

[Lars Viklund]

If you're noticing the adblock/greasemonkey/stylish addons in my toolbar, I've verified this in a separate profile as well.

Comment 3

[u232883]

I cannot reproduce the issue on the latest Nighyly for macOS. The font is served from Google Fonts. Not sure Bug 1331797 is related. Can you please find a regression range with mozregression? https://mozilla.github.io/mozregression/

Comment 4

[Jonathan Kew [:jfkthame]]

The Fira Mono font they're serving is invalid; see the Browser Console for error messages:

downloadable font: Layout: DFLT script doesn't satisfy the spec. DefaultLangSys is NULL (font-family: "Fira Mono" style:normal weight:normal stretch:normal src index:2) source: https://fonts.gstatic.com/s/firamono/v5/SlRWfq1zeqXiYWAN-lnG-pBw1xU1rKptJj_0jans920.woff2

(Kohei, do you have Fira Mono installed locally? If so, it probably uses that instead of a resource from Google Fonts. Or if you have set gfx.downloadable_fonts.otl_validation to 'false' in about:config, the font from Google will be accepted despite the error. That's also why a release build doesn't show the problem.)

Comment 5

[u232883]

Ah yes, disabling Fira Mono locally reproduces the issue. Then marking as a dup of Bug 1331797 which I've already documented as https://fxsitecompat.com/en-CA/docs/2016/some-web-fonts-may-not-be-displayed-due-to-stricter-validation/