CSS font descriptors wrongly validated as font properties

[MurakamiShinyu]

CSS font descriptors in @font-face rules are wrongly validated as font properties and cause warnings "E_INVALID_PROPERTY_VALUE".

For example, font-weight: 300 400 in @font-face rule is a valid font descriptor, but it is wrongly validated as font-weight property which cannot have two values and causes a warning:

E_INVALID_PROPERTY_VALUE font-weight: 300 400

Test case: https://github.com/web-platform-tests/wpt/blob/master/css/css-fonts/variations/font-descriptor-range-reversed.html

Test with Vivliostyle Viewer (v2.28.1): https://vivliostyle.github.io/viewer/v2.28.1/#src=https://github.com/web-platform-tests/wpt/blob/master/css/css-fonts/variations/font-descriptor-range-reversed.html

Screenshot:

[MurakamiShinyu]

Fixed in #1308.

Test: https://vivliostyle-git-fix-issue1307-vivliostyle.vercel.app/#src=https://github.com/web-platform-tests/wpt/blob/master/css/css-fonts/variations/font-descriptor-range-reversed.html

Screenshot: