W3C home > Mailing lists > Public > xsl-editors@w3.org > October to December 2001

Reference pixel size

From: J.J.SOLARI <jjsolari@pobox.com>
Date: Wed, 14 Nov 2001 22:49:25 +0100
To: xsl-editors@w3.org
Message-ID: <20011114224926-r01010800-dcd868cc-0910-0108@>

The following comes from XSL 1.0 Recommendation,
section Pixels:


The actual distance covered by the largest integer number of
device dots (the size of a device dot is measured as the distance
between dot centers) that spans a distance less-than-or-equal-to
the distance specified by the arc-span rule in
In XSL this is assumed to be 0.28mm [approximately 1/90"]
for print, desktop computer monitors,
and hand-held devices viewed at normal viewing distances.


When you follow the link to CSS2 Rec. (above URL), you just read these
very same values (i.e. 0.28mm and 1/90").

But, when you go to the Errata page for CSS2,
it is said in the Known Errors Section 4.3.2 Lengths (near top of the
page), that:

[2001-08-28] The suggested reference pixel is based on a 96 dpi device,
not 90 dpi. The visual angle is thus about 0.0213 degrees instead of
0.0227, and a pixel at arm's length is about 0.26 mm instead of 0.28 

Do values given in the XSL Recommendation need to be changed?

Translating the Recommandation into French,

/* home page <http://www.yoyodesign.org/> */
/* public key id: 9eb99ddb <http://www.keyserver.net/> */
Received on Wednesday, 14 November 2001 16:49:36 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 6 January 2015 20:44:22 UTC