Should SVG keep or drop dominant-baseline values not supported by CSS? about svgwg

[nikosandronikos]

SVG 1.1 'dominant-baseline' is based on the XSL 'dominant-baseline'. It includes additional values other than those currently in CSS Inline:

1. 'use-script'
2. 'no-change'
3. 'reset-size'
4. 'ideographic'
5. 'middle'
6. 'text-after-edge'
7. 'text-before-edge'

[nikosandronikos]

Could CSS add the currently unsupported options?

[AmeliaBR]

CSS Inline Layout includes text-after-edge and text-before-edge as synonyms for text-bottom and text-top respectively for the alignment-baseline property, which may be supported in SVG implementations for backwards compatibility. It seems reasonable to extend that to dominant-baseline; the SVG WG could probably also ask for that may to be upgraded to a must without much pushback. The reason they changed the terminology (despite the fact that after/before is more general than top/bottom) is to match up with the existing CSS vertical-align property.

I don't know why ideographic is not preserved, although I think it usually works out as equivalent to text-bottom. Maybe we could ask for it to be added as an official synonym, too? middle exists in the latest CSS drafts for alignment-baseline, although I'm not sure that the wording is entirely consistent with SVG. I would strongly argue for it to be available for dominant-baseline. It's the best option for center-aligning lowercase text in SVG.

The other values are more complex from an implementation standpoint. We'd probably need some real-world use cases to convince CSS & user agents to join on. Do you have examples & a working implementation @Tavmjong ?

I would prefer to avoid SVG-specific terminology, but I also recognize that dominant-baseline is much more relevant in SVG text-around-an-anchor-point than in CSS text-in-a-box.

[nikosandronikos]

CSS has a trimmed down list of baseline values. They have an open issue to check what's actually needed.
http://logs.csswg.org/irc.w3.org/css/2016-02-02/#e649804

Might be this action?
https://www.w3.org/Style/CSS/Tracker/actions/631

We should keep an eye on changes so we can review them when they happen.

[nikosandronikos]

Waiting on w3c/csswg-drafts#201

[nikosandronikos]

Added in w3c/csswg-drafts@fd68a2e