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Re: Resize Text (1.4.4)

From: David Woolley <forums@david-woolley.me.uk>
Date: Thu, 06 Aug 2009 22:10:23 +0100
Message-ID: <4A7B46BF.7040406@david-woolley.me.uk>
To: w3c-wai-ig@w3.org
CC: 'W Reagan' <wreagan1@yahoo.com>
Jonathan Avila wrote:
> Perhaps there is a bug in Opera?  My thinking regarding browser support 
> for Zoom is similar to the requirements for “supported by assistive 
> technology” which requires that there be a cross section of support w/ 
> AT for the web page but doesn’t require that it work with all forms of 
> AT.  All information technology products have bugs/defects.  I would say 
> that if the zoom feature works correctly across several major browsers 
> that would be a good argument for conformance to this checkpoint. 

Noting that I think Opera should acknowledge this is a bug, before one 
accepts it as a bug, I believe there is a principle in statistical 
quality control that if you get one failure in a small sample, you need 
to use a much larger sample than would be acceptable for no failures, 
before you can have reasonable confidence that failure was a statistical 

The situation here isn't quite the same, and the total population is 
rather small, but I would suggest if you fail on two browsers, you test 
on all the browser engine families that support zooming, before you 
accept it as an outlier.

David Woolley
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Received on Thursday, 6 August 2009 21:11:06 UTC

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