[css-fonts] Should `font-style: oblique 0deg` serialize as `oblique 0deg` or `normal`?

[weinig]

The WPT tests are a bit inconsistent on what they say, as are the implementations, but should font-style: oblique 0deg serialize as oblique 0deg or normal?

In https://wpt.fyi/results/css/css-fonts/variations/font-style-parsing.html, the test indicates font-style: oblique 0deg should serialize as is.

In https://wpt.fyi/results/css/css-fonts/animations/font-style-interpolation.html, the test indicates font-style: oblique 0deg should serialize as normal.

My guess is the animation test is wrong, as the spec, https://drafts.csswg.org/css-fonts-4/#font-style-prop, states that the computed value should be:

the keyword specified, plus angle in degrees if specified

and the animation type should be:

by computed value type;normal animates as oblique 0deg

[Loirooriol]

Not familiar with this, but they seem to have different behaviors, so I would expect different serializations

• normal: Matches against a face that is classified as a normal face, one that is neither italic or obliqued.
• oblique <angle>: Controls matching against an oblique face.