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@10.0.1.52>

Hello,

The following comes from XSL 1.0 Recommendation,
section 5.9.13.1 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
<http://www.w3.org/TR/REC-CSS2//syndata.html#x39</a>.
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,
<http://www.w3.org/Style/css2-updates/REC-CSS2-19980512-errata.html>
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,

JJS.
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Received on Wednesday, 14 November 2001 16:49:36 UTC