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Re:Roboto but Make It Flex by Nullabillity on Saturday May 07, 2022 @07:26AM (#31293689)
This seems to be an issue with the Google Fonts API, not Firefox itself.

For me (Firefox 100, Arch Linux) all the options work fine on https://v-fonts.com/fonts/roboto-flex (all of them have _some_ effect, have smooth transitions, and look roughly the same as in Chromium), but on https://fonts.google.com/specimen/Roboto+Flex?query=roboto#t... the only option that does anything is Weight, and that one only snaps into one of three broad categories.

Re:Roboto but Make It Flex by wildrhythms on Saturday May 07, 2022 @07:53AM (#31293812)
Re:Roboto but Make It Flex by Nullabillity on Saturday May 07, 2022 @07:26PM (#31299632)
No, it's a GFonts bug that they're overly eager to work around a DW bug, even if the system doesn't even have DW installed.
Re:Roboto but Make It Flex by runarberg on Saturday May 07, 2022 @11:59AM (#31295666)
I recently incorporated a variable font into a web app at $WORK (as in less then 6 months ago). And I remember seeing some issues like that Using google hosted variable fonts just didn’t seem to work in firefox. There was something about defining the range in the @font-face rule which google font omits (or does differently), or how variable fonts are consumed (font-weight vs font-variation-settings).

My conclusion was—if my memory is accurate—that there was no way we could use google hosted fonts (you should always self host your fonts anyway if you can) and you needed split files for italics (the italic axis simply doesn’t work consistently across browsers).

EDIT: Here is an article describing the current state of the italics axis in browsers: https://rwt.io/typography-tips/getting-bent-current-state-it...