W3C home > Mailing lists > Public > www-svg@w3.org > May 2005

Re: SVG12: height/width defaults

From: David Woolley <david@djwhome.demon.co.uk>
Date: Mon, 23 May 2005 21:11:49 +0100 (BST)
Message-Id: <200505232011.j4NKBnw07864@djwhome.demon.co.uk>
To: www-svg@w3.org

>   * the px unit should not be referred to as absolute unit as CSS
>     considers it a relative unit.

It's really a mixture of both and this causes problems when people are
trying for mere letter of the law compliance on Accessibility as they
think px is OK when it usually isn't.   Viewed over a very wide range
of physical pixel densities, px is relative in that it is approximately
1/800th of the display width.  Viewed over the typical range of desktop
diplays, it is physical because it maps one to one with device pixels.

(I strongly suspect that PDA and mobile implementations also treat it
as physical even though screen widths are a lot less than 800 physical
pixels, so, for example, a typical PDA ought to be using up to 6 px 
per physical pixel.)
Received on Monday, 23 May 2005 20:34:20 GMT

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