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SC 2.4.6 (Focus order) and (reverse) tab order

From: Christophe Strobbe <christophe.strobbe@esat.kuleuven.be>
Date: Mon, 19 Feb 2007 16:16:21 +0100
Message-Id: <6.2.5.6.2.20070219160518.02a3a1b0@esat.kuleuven.be>
To: WCAG <w3c-wai-gl@w3.org>

Hi,

During a review of test cases in the BenToWeb test suite for WCAG 
2.0, the following occurred to me:
SC 2.4.6 requires that "When a Web unit or authored component is 
navigated sequentially, components receive focus in an order that 
follows relationships and sequences in the content." However, there 
are many types of content that can be tabbed through both in "normal" 
order (usually top to bottom, just pressing the TAB key) and in 
reverse order (pressing SHIFT + TAB). It is possible for scripts to 
manipulate the focus in such a way that certain items are skipped in 
normal tabbing order but not in reverse tabbing order. This would 
fail the intent of SC 2.4.6 but this is not made explicit anywhere.

An example of this behaviour can be seen at 
<http://www.bentoweb.org/ts/XHTML1_TestSuite2/testfiles/sc3.2.5_l3_027.html>. 
When tabbing through this file, focus goes from the first to the 
third link (the second links is skipped because an 'onblur' event on 
the first link changes focus to the third link). When tabbing in 
reverse order, however, you get all the links.

Best regards,

Christophe


-- 
Christophe Strobbe
K.U.Leuven - Departement of Electrical Engineering - Research Group 
on Document Architectures
Kasteelpark Arenberg 10 - 3001 Leuven-Heverlee - BELGIUM
tel: +32 16 32 85 51
http://www.docarch.be/ 


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Received on Monday, 19 February 2007 15:16:48 GMT

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