- From: Jonathan Watt <jonathan.watt@strath.ac.uk>
- Date: Wed, 04 Jan 2006 18:54:03 +0000
- To: www-svg@w3.org, Dean Jackson <dino@w3.org>
- CC: Chris Lilley <chris@w3.org>
Dean Jackson wrote: > If we can have a solution where authors get to use stroke-width="4" in > XML content and are required to use "{stroke-width: 4px}" in > stylesheets, then I'm happy. I would be happier if CSS hadn't required > units on <length>s, but I have a sneaking suspicion that that won't change. Me too. So how about for the sake of its implementors and its users the SVG WG be the one to back down in this case. This issue has gone on way too long, and it is SVG users that are being hurt, not the CSS-in-HTML crowd. I'm not entirely happy about having to use units in CSS, but assuming we're the ones to back down, I propose that the SVG WG change some of the properties to accept a <number> as well as a <length>. There are eight properties relevant to SVG that can currently take a <length> (and thus are affected by this issue): Four SVG-only properties: stroke-width stroke-dashoffset baseline-shift kerning Four CSS properties: font font-size letter-spacing word-spacing The SVG-only properties could be changed to allow <number> and define the value to act in user units. Something like: 'stroke-width' Value: <length> | <number> | inherit Initial: 1 Applies to: shapes and text content elements Inherited: yes Percentages: Yes Media: visual Animatable: yes <length> ... <number> Acts as if a unit of 'px' had been specified (i.e. the value is in user units). (That text of course assumes that px IS always equivalent to user units.) I'm not sure what to do about the remaining four "generic" CSS properties. Perhaps a request to the CSS WG that they also allow <number> for those properties and define them to behave as if 'px' had been provided as the unit? It would solve our backwards compatibility problems with existing content, and since they haven't defined <number> for these properties I assume they don't have a use in mind for it and never will. Anyway, regardless of the response of the CSS WG to that request, I think that removing the problem from the four SVG specific properties would be *very* beneficial and worthwhile. It is a *lot* easier for users to remember the names of four generic CSS properties to which they must add 'px' than it is to remember the names of a mixture of eight CSS and SVG properties. It would also allow some of the content that is currently a problem to work in UAs that put a higher priority on CSS than SVG conformance. Regards, Jonathan
Received on Wednesday, 4 January 2006 19:36:00 UTC