[css-shapes] Why does this spec need to special-case serialization of <position>?

[emilio]

See web-platform-tests/wpt#9339 (comment).

The spec says:

The values (including the defaults) in ellipse() and circle() serialize to their 2- and 4-value forms only, preferring the 2-value form when it can be expressed without calc(), preferring left and top origins, and preferring 0% over a zero length.

Firefox right now special-cases that to follow the spec, but I think it'd be more sane and consistent to just use the regular serialization. Is there any reason that sentence was added to the spec?

[emilio]

This is https://drafts.csswg.org/css-shapes/#basic-shape-serialization, btw.

[fantasai]

See related issue in #2274 ...

[ewilligers]

This has been resolved in
#2274 (comment)
and the spec should be updated by removing the relevant language from the shapes spec. All <position> values serialize the same way.

[astearns]

I've removed the wrong text from css-shapes.