- From: Koji Ishii <kojiishi@gmail.com>
- Date: Mon, 8 Jun 2015 16:43:25 +0900
- To: 塩澤 元 (Shiozawa, Hajime) <hajime.shiozawa@gmail.com>
- Cc: Gérard Talbot <css21testsuite@gtalbot.org>, Koji Ishii <kojiishi@gluesoft.co.jp>, Public CSS test suite mailing list <public-css-testsuite@w3.org>
On Sun, Jun 7, 2015 at 6:01 PM, 塩澤 元 (Shiozawa, Hajime) <hajime.shiozawa@gmail.com> wrote: > Koji, > > >> >> Hajime, >> >> When an inline-block (with block descendants) is in a 'writing-mode: >> vertical-rl' context with 'text-orientation: mixed' or with >> 'text-orientation: upright', then the horizontal center of inline-block's >> margin box is used for baseline-alignment with the central (dominant) >> baseline >> >> >> " >> If an atomic inline (such as an inline-block, inline-table, or replaced >> inline element) is not capable of providing its own baseline information, >> then the UA synthesizes a baseline table thus: >> >> alphabetic >> The alphabetic baseline is assumed to be at the under margin edge. >> central >> The central baseline is assumed to be *_halfway between the under and >> over margin edges of the box_*. >> " >> 4.3. Atomic Inline Baselines >> http://dev.w3.org/csswg/css-writing-modes-3/#replaced-baselines >> >> and this is what Firefox does: it aligns the center of the inline-block's >> margin box with the central baseline. >> >> >> >> What Chrome does is trying to apply: >> " >> The baseline of an 'inline-block' is the baseline of its last line box in >> the normal flow (...) >> " >> CSS 2.1, 10.8.1 Leading and half-leading >> http://www.w3.org/TR/CSS21/visudet.html#leading >> >> which is wrong in my opinion in the context of dominant central baseline. >> >> Example given: >> >> >> http://www.gtalbot.org/BrowserBugsSection/CSS3WritingModes/vert-align-latin-baseline-inline-block-dhtml.html >> >> or >> >> >> http://www.gtalbot.org/BrowserBugsSection/CSS3WritingModes/vert-align-japan-baseline-inline-block-dhtml.html >> >> 'vertical-align: text-top', 'vertical-align: text-bottom', >> 'vertical-align: top' and 'vertical-align: bottom' appear to be rendered as >> expected in both Firefox and Chrome. I think Chrome has a decisive >> implementation bug for baseline-aligning inline-blocks (which uses block >> descendants). > > > Koji, what do you think? > Does Chrome have bug? Can you try to create a case that stands out the difference and ask at www-style? As far as I understand, 4.3 applies only when "is not capable of providing its own baseline information", and when inline-blocks have children, using the last line box is correct. Am I correct to understand, what Gérard is saying is that, if all children of an inline-block are block, there should not be a line box and thus the inline-block should not be able to provide its own baseline information? That's quite a case that I can hardly answer which is what the spec defines. I wonder, this is not a vertical-flow specific issue and you could probably create a case where the diff appear in horizontal flow too, and www-style could better answer to the quesiton. /koji
Received on Monday, 8 June 2015 07:43:55 UTC