Re: [csswg-drafts] [css-fonts-4] font-display says it's valid in @font-feature-values but it isn't an at-rule (#2973)

From: Ramanan via GitHub <sysbot+gh@w3.org> Date: Wed, 13 Feb 2019 19:01:30 +0000 To: public-css-archive@w3.org Message-ID: <issue_comment.created-463323859-1550084488-sysbot+gh@w3.org> · This archive was generated by hypermail 2.4.0 : Tuesday, 5 July 2022 06:41:43 UTC

Reposting https://github.com/google/fonts/issues/358#issuecomment-463322909 here: 

Hi all,

I want to take this opportunity to point to a potential issue with `@font-feature-values`

I came across this tweet:

https://twitter.com/pjchrobak/status/1059229076987301888

It seems removing semicolon in `font-display` in `@font-feature-values` breaks Firefox CSS below that for older versions.

> Keep in mind, that if you add
> `@font-feature-values FontName {   font-display: whatever; }` without semicolon after value (what minifiers do), older versions of Firefox stop render whole CSS after this descriptor 🤯

I tested this on Browserstack with Firefox 56 in MacOS Mojave and the tweet seems right!

![image](https://user-images.githubusercontent.com/13736892/52736404-ccbae380-2fef-11e9-8ffa-6f189dcfbf36.png)

Firefox 57 onward fine but this raises questions about the syntax.

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