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Should apply Keyboard Traps to breaking the browser Back button.

From: <noreply@w3.org>
Date: Thu, 11 Feb 2016 22:13:09 +0000
To: public-comments-wcag20@w3.org
Message-Id: <E1aTzU5-000FiE-9X@deneb.w3.org>
Name: Mark Malamud
Email: mmalamud@nih.gov
Affiliation: NIH
Document: UW
Item Number: Understanding Success Criterion 2.1.2
Part of Item: Intent
Comment Type: technical
Summary of Issue: Should apply Keyboard Traps to breaking the browser Back button.
Comment (Including rationale for any proposed change):
It is extremely frustrating when a web page blocks the use of the Back button on the browser.  This is a significant usability issue and was identified by Jakob Nielsen in his "Top 10 Web Design Mistakes" in May 1999.
I strongly recommend that this interpretation be added as another form of keyboard trap.

Proposed Change:
Add the proposed text [ALL CAPS] to Understanding SC 2.1.2:

The intent of this Success Criterion is to ensure that that content does not "trap" keyboard focus within subsections of content on a Web page. This is a common problem when multiple formats are combined within a page and rendered using plug-ins or embedded applications.  [IN ADDITION, THE FOCUS SHOULD NOT BE "TRAPPED" ON A WEB PAGE, PREVENTING THE USER FROM USING THE BACK BUTTON TO RETURN TO A PREVIOUS WEB PAGE.] 
Received on Thursday, 11 February 2016 22:13:12 UTC

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