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Re: [csswg-drafts] [css-ruby][css-inline][css-pseudo] Interaction of initial letter and ruby

From: Florian Rivoal via GitHub <sysbot+gh@w3.org>
Date: Mon, 31 Oct 2016 04:08:32 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-257210254-1477886910-sysbot+gh@w3.org>
Sounds good. I though there ought to be uses cases for that, and I 
looked for them in printed material, and failed. So making this 
explicitely undefined sounds OK.

So, what would making this undefined entail?

Do we just add a sentence to 
https://drafts.csswg.org/css-ruby-1/#ruby-layout saying "How this 
interacts with the initial-letter property is undefined in this 
level", or do we try to pinpoint the undefinedness to something more 
more specific?

The way I see it, the problem is in :

[issue 1 in the ruby 
spec](https://drafts.csswg.org/css-ruby-1/#issue-ca88244c):

> Are internal ruby boxes inline-level?

and the way it combines with the [apply line from the initial-letter 
property](https://drafts.csswg.org/css-inline/#sizing-drop-initials):

> Applies to:   ::first-letter pseudo-elements and inline-level first 
child of a block container

as well as this sentence:

> When a ruby structure is laid out, its base level is laid out on the
 line, aligned according to its vertical-align property exactly as if 
its ruby bases were a regular sequence of inline boxes.


If “a regular sequence of inline boxes” means that ruby bases are 
inline-level boxes, then initial-letter should applies. Then we have 
to determine:
* Is the initial-letter box is a child box of the inline-level box it 
comes from? (is that the thing we leave undefined?)
  * If yes, how does it influence the margin box of that inline-level 
box? As far as I can tell from the initial-letter spec, the margin box
 of the initial letter itself is well defined, but that's not the same
 question.
  * If the initial-letter box is not a child of the inline-level box 
it comes from, then presumably it is a sibling, and presumably that 
box isn't inline level. Is that right? what happens to this box when 
it is a child of a ruby ruby-base-container box? [step 2 of Anonymous 
Ruby Box 
Generation](https://drafts.csswg.org/css-ruby-1/#anon-gen-inlinize) 
says it becomes display:inline or display:inline-block. Does that 
cancel out the effects of the initial-letter property? (is that the 
thing we leave undefined?)
    * If it does not, how does [step 
3](https://drafts.csswg.org/css-ruby-1/#anon-gen-bare-inlines) work? 
What's the implication of wrapping a (not inline-level) initial letter
 box and the rest of the inline-level box it came from into an 
anonymous inline-level box on the exclusion effect of the initial 
letter? (is that a thing we leave undefined as well?)


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Received on Monday, 31 October 2016 04:08:38 UTC

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