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Re: [WICD] How to create mixed SVG/CSS style sheets

From: Chris Lilley <chris@w3.org>
Date: Fri, 21 Jul 2006 13:05:57 +0200
Message-ID: <1169972397.20060721130557@w3.org>
To: Ian Hickson <ian@hixie.ch>
Cc: public-cdf@w3.org

On Friday, July 21, 2006, 12:32:31 PM, Ian wrote:

IH> On Wed, 19 Jul 2006, Chris Lilley wrote:
>> Bert wrote:
>> >
>> > E.g., in an SVG style sheet, you can write
>> > 
>> >     font-size: 7
>> > 
>> > which is defined to be the same as
>> > 
>> >     font-size: 7px
>> (Sort of. 7px is defined to be the same as 7 user units. if that gets
>> scaled, the result could be very far from 7 screen pixels)

IH> Not "sort of", Bert is exactly correct

This is tangential to the actual comment but no, he has it the wrong way
round. He says that 7 user units is defined to be the same as 7 px which
(as you correctly point out below) is not the case.

IH> -- in SVG, the two declarations
IH> above are defined to be exactly equivalent to each other.

Sort of. But you have it correct later on.

IH>  "px" in SVG has
IH> no relation to screen pixels, the unit "px" is defined to be equivalent to
IH> user units.

Yes, exactly. Note the order. Note that this is not commutative. User
units are not defined to be equivalent to px. Px are defined to be
equivalent to user units.

The difference is readily seen as soon as there is a viewBox or a
transform involved, ie most of the time.

However, all that aside, the comment on how different lexical forms in
presentation attributes and in style sheets, and how to create mixed
style sheets by using

a) the lexical forms allowed by CSS, and
b) @namespace

still stands.

 Chris Lilley                    mailto:chris@w3.org
 Interaction Domain Leader
 Co-Chair, W3C SVG Working Group
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG
Received on Friday, 21 July 2006 11:06:10 UTC

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