[css-ruby-1] Size/position of annotation container for inter-character ruby

[fantasai]

@upsuper wrote in https://lists.w3.org/Archives/Public/www-style/2015Mar/0118.html :

The current spec says:

When ruby-position indicates inter-character annotations, ... The affected ruby annotation container is similarly sized so that its content box coincides with that of the ruby base container.

This will cause a very undesired problem that the text container will block any pointer event to reach the base texts, because it is always covered over the base container.

Hence I propose that, the content box of inter-character text container should be empty.

[fantasai]

@upsuper Totally fine with making the change you request, it makes sense. But there's several ways to interpret it:

• size and position it like a zero-height interlinear over annotation container
• size and position it like a zero-width inter-character annotation (after the last base)
• size it zero-zero and position it ... somewhere?

Which option do you think makes the most sense? (I'm personally leaning towards 2, since it at least relates to how the annotations are positioning somewhat, but it doesn't particularly matter.)

[upsuper]

I would prefer 1 (and I suppose you mean over base container not annotation container), as even for inter-character I think rb-rb-rt-rt style is still possible, and thus it would be good to still have the annotation container span across its bases somehow. Putting it at the end of the last base makes its behavior further diverge from others, which could become another nuisance impls need to handle for no good reason.

As implementation may position ruby annotation relative to the container, it might be good to make it always immediately over the base container, rather than stack with other annotation levels.

[fantasai]

@upsuper OK. Detail: So normally an annotation container won't span the last inter-character annotation, since interlinear annotations center over the base ignoring its inter-character annotation(s). Should it be the same here, or should these span all their bases and their annotations?

[upsuper]

I will try to implement inter-character and see how it goes then feedback here.