Request for Mozilla Position on support for a not-yet-shipped part of an existing web specification

• Specification Title: Extend supports(<font-technology>) syntax in parsing the src: descriptor, part of the CSS Fonts spec
• Specification or proposal URL: https://drafts.csswg.org/css-fonts-4/#font-face-src-parsing
• Mozillians who can provide input (optional): @jfkthame

Other information

The changes have originally been approved / developed in the CSS WG process already. As we're considering shipping this feature, we'd like to know if Mozilla is considering implementing support as well.

• CSS WG Resolution for issue #633 initially adding format() and supports() syntax
• CSS WG change in issue #6340 to clarify parsing rules for supports syntax