- From: Philip Taylor <pjt47@cam.ac.uk>
- Date: Thu, 19 Nov 2009 20:09:42 +0000
- To: David Carlisle <davidc@nag.co.uk>
- CC: www-math@w3.org, public-html@w3.org
(Not speaking on behalf of anyone or suggesting any spec changes, just commenting on a few things I saw here...) David Carlisle wrote: >> 8. In the section describing color[3] you reference color names from >> HTML4. Is there a reason MathML doesn't use css3-color SVG color >> keywords instead of HTML4 color keywords? > > Initially (MathML1) there was no css3-color or svg. > We did look briefly at extending this list but it wasn't clear that this > would be useful: it doesn't really add any new functionality (since hex > colours are supported) Using CSS3 Color could add RGBA functionality, which would be new. (Not saying it's necessarily a good idea, though!) > and typically isn't currently supported by MathML2 systems. SVG colors seem to be supported by Firefox 3.5: data:application/xml,<math%20xmlns="http://www.w3.org/1998/Math/MathML"><mi%20mathcolor='tomato'>Test</mi></math> (I can't say anything about other MathML systems, though.) > HTML5 has these extended color names but introduces > them as > > "Some obsolete legacy attributes parse colors in a more > complicated manner," > > which doesn't really encourage these colours to be added as a new feature > to other specs such as MathML3 The obsoleteness is about the attributes and the parsing algorithm, rather than about the colours - that part of the spec is needed for cases like <body bgcolor="cheese"> (a nice greenish yellow colour, since it's parsed like #c0ee0e (for legacy reasons), and it's non-conforming anyway because bgcolor is never allowed). As far as I can see, the only place HTML5 uses colours in a non-obsolete fashion is for <canvas>, and there it refers to CSS3 Color for the full list of colour types and keywords. All other uses of colour in a web browser are just CSS, so HTML5 is not involved in the definition of that; browsers largely follow CSS3 Color there. -- Philip Taylor pjt47@cam.ac.uk
Received on Thursday, 19 November 2009 20:10:16 UTC