[csswg-drafts] [css-display] list-item syntax does not allow <display-inside>

Loirooriol has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-display] list-item syntax does not allow <display-inside> ==
CSS Display says this in [Generating Marker Boxes: the `list-item` keyword](https://drafts.csswg.org/css-display/#list-items):

> If no `<display-inside>` value is specified, the principal box’s inner display type defaults to `flow`.

However, the syntax of `<display-listitem>` does not allow `<display-inside>`, only `flow` or `flow-root :

>     <display-listitem> = list-item && <display-outside>? && [ flow | flow-root ]?

Yes, `flow` and `flow-root` are `<display-inside>` values, but this seems a coincidence. The spec should say that, in a `<display-listitem>` value, the `flow` and `flow-root` keywords (if any) behave like they do in `<display-inside>`.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/1226 using your GitHub account