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Re: WCAG2 Conformance Questions

From: Loretta Guarino Reid <lorettaguarino@google.com>
Date: Wed, 30 Jul 2008 19:10:36 -0700
Message-ID: <824e742c0807301910l488e53e4obd18998cf7ad1b0a@mail.gmail.com>
To: "Peter Thiessen" <peter.thiessen@primalfusion.com>
Cc: "w3c-wai-ig@w3.org" <w3c-wai-ig@w3.org>

Hi, Peter,

Because we are trying to understand where our documents are not
providing sufficient information, I'm going to answer your questions
with some pointers and some questions back.

On Wed, Jul 30, 2008 at 4:17 PM, Peter Thiessen
<peter.thiessen@primalfusion.com> wrote:
> Hello,
> I've been working towards updating my companies Web interface/content to be WCAG2 AA compliant, and potentially submit it as a Implementation.
> A few questions that have come up while using the guidelines:
> -are alt tags required?

Alt altributes are one of the ways of satisfying SC 1.1.1. However it
is a complex success criterion. We have tried to cover the different
options and situations in Understanding SC 1.1.1 at
Is there a situation where you are wondering whether to provide an alt
attribute or use some other form of text alternative?

> -our site pulls aggregated content from an external source, despite the local content being WCAG compliant, our site at best can only receive a Statement of Partial conformance?

The section of WCAG on "Statement of Partial Conformance" at
http://www.w3.org/WAI/GL/WCAG20/#conformance-partial discusses two
possibilities for aggregated content. Is there sufficient information
there for you to determine which of the two options applies to your

> -for guideline 2.3.2, what constitutes a flash or flicker? Our site contains some JS behavior that causes a DOM node to slide across the screen at movement rate of 200ms (>3 updates per second) could this potentially cause a seizure?

Can you tell us whether our definitions of flash (
http://www.w3.org/WAI/GL/WCAG20/#flash-def ) and general flash and red
flash thresholds (
http://www.w3.org/WAI/GL/WCAG20/#general-thresholddef ) answer the
question of what constitutes flash, and if not, what additional
information is needed? Do the resources listed in Uhnderstanding 2.3.2
( http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20080505/seizure-three-times.html
) help?

> -for guideline 3.3.4, our site contains mainly key words etc. and no legal or financial information, what does "Data" refer to in "Error Prevention (Legal, Financial, Data)"?

"Data" in the handle for SC 3.3.4 refers to the clause "that modify or
delete user-controllable data in data storage systems", where
"user-controllable" is defined at
http://www.w3.org/WAI/GL/WCAG20/#user-controllabledef . Is it clear
from the definition whether your site manages user-controllable data?

> Regards
> -peter

Received on Thursday, 31 July 2008 02:11:14 UTC

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