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RE: another try at a proposal for scaling

From: Sean Hayes <Sean.Hayes@microsoft.com>
Date: Wed, 15 Nov 2006 17:16:38 +0000
To: Becky Gibson <Becky_Gibson@notesdev.ibm.com>, "w3c-wai-gl@w3.org" <w3c-wai-gl@w3.org>
Message-ID: <7261AC2A5F73904CA41773C8F00813FF0BD3EF80@EA-EXMSG-C309.europe.corp.microsoft.com>

Although pixel is classified as relative to the display device; it is still a physical measure (0.0213 degrees) - which is why I said physical and not relative. When devices scale pixels, they are supposed to do so to preserve this viewing angle.

If we want an SC to do with scaling (I'm happy to leave it out), then it needs to call out using px as a failure.

Sean Hayes
Standards and Policy Team
Accessible Technology Group
  mob +44 7977 455002
  office +44 117 9719730

-----Original Message-----
From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf Of Becky Gibson
Sent: 15 November 2006 14:35
To: w3c-wai-gl@w3.org
Subject: Re: another try at a proposal for scaling

>Failures could include:
>1.      Using measures which are based on a physical length (for example:
px, in, pt in CSS)
I know it is a controversial subject, but I do have some concerns about
creating a failure which outlaws the use of px.  Even the W3C Tips for
Webmasters [1] doesn't speak against using px (although I will admit that
reference, dated 2003 is rather old).  Also, px are listed as relative
units in the CSS2 specification [2]. Since user agent support for
different font sizing mechanisms seems to vary greatly and change over
time, I'm not sure we should be making a specific recommendation.

[1] http://www.w3.org/QA/Tips/font-size
[2] http://www.w3.org/TR/REC-CSS2/syndata.html#length-units

Becky Gibson
Web Accessibility Architect

IBM Emerging Internet Technologies
5 Technology Park Drive
Westford, MA 01886
Voice: 978 399-6101; t/l 333-6101
Email: gibsonb@us.ibm.com
Received on Wednesday, 15 November 2006 17:16:56 UTC

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